2014 JAMB CHEMISTRY PAST QUESTIONS AND ANSWERS Leave a Comment / Jamb Chemistry / By Jamb Tutor Report a question What’s wrong with this question? You cannot submit an empty report. Please add some details. 0% 0 votes, 0 avg Created by Jamb TutorJamb Chemistry 2014 JAMB CHEMISTRY PAST QUESTIONS AND ANSWERS 1 / 50 Category: JAMB Chemistry 2014 1. $$\text{1. Which Question Paper Type of Chemistry is given to you?}$$ a) $$\text{Type F}$$ b) $$\text{Type E}$$ c) $$\text{Type L}$$ d) $$\text{Type S}$$ $$\text{The paper type identifies the specific version of the exam given to the candidate.}$$ 2 / 50 Category: JAMB Chemistry 2014 2. $$\text{2. A mixture is different from a compound because}$$ a) $$\text{Properties of a compound are those of its individual constituents, while those of a mixture differ from its constituents}$$ b) $$\text{A mixture is always homogeneous, while a compound is not}$$ c) $$\text{The constituents of a compound are chemically bound together, while those of a mixture are not}$$ d) $$\text{A mixture can be represented by a chemical formula, while a compound cannot}$$ $$\text{In a mixture, the constituents are not chemically combined and retain their individual properties.}$$ 3 / 50 Category: JAMB Chemistry 2014 3. $$\text{3. What is the percentage of sulphur in sulphur (IV) oxide?}$$ a) $$66\%$$ b) $$25\%$$ c) $$40\%$$ d) $$50\%$$ $$\text{Calculate the molar mass of SO}_2 \text{: S (32) + O}_2 (16 \times 2) = 64 \text{ g/mol. Percentage of S is }\frac{32}{64} \times 100\% = 50\%.}$$ 4 / 50 Category: JAMB Chemistry 2014 4. $$\text{4. A gas X diffuses twice as fast as gas Y. If the relative molecular mass of X is 32, calculate the relative molecular mass of Y.}$$ a) $$128$$ b) $$8$$ c) $$16$$ d) $$64$$ $$\text{According to Graham’s law: Rate}_X/Rate_Y = \sqrt{\text{M}_Y/\text{M}_X} \Rightarrow 2 = \sqrt{\text{M}_Y/32} \Rightarrow \text{M}_Y = 128.$$ 5 / 50 Category: JAMB Chemistry 2014 5. $$\text{5. 200 cm}^3 \text{ of a gas at }25^{\circ}\text{C exerts a pressure of }700\ \text{mmHg. Calculate its pressure if its volume increases to }350\ \text{cm}^3 \text{ at }75^{\circ}\text{C.}$$ a) $$342.53\ \text{mmHg}$$ b) $$1430.54\ \text{mmHg}$$ c) $$467.11\ \text{mmHg}$$ d) $$400.00\ \text{mmHg}$$ $$\text{Use combined gas law: } \frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}. Convert temperatures to Kelvin. Solve for } P_2.$$ 6 / 50 Category: JAMB Chemistry 2014 6. $$\text{6. An element X has electron configuration }1s^2 2s^2 2p^6 3s^2 3p^5.\ \text{Which of the following statements is correct about the element?}$$ a) $$\text{It has a completely filled p-orbital}$$ b) $$\text{It has 5 electrons in its outermost shell}$$ c) $$\text{It belongs to Group II on the periodic table}$$ d) $$\text{It is a halogen}$$ $$\text{The element has 7 valence electrons and is a halogen (Group VII).}$$ 7 / 50 Category: JAMB Chemistry 2014 7. $$\text{7. Beryllium and aluminum have similar properties because they}$$ a) $$\text{Are both metals}$$ b) $$\text{Belong to the same group}$$ c) $$\text{Belong to the same period}$$ d) $$\text{Are positioned diagonally to each other}$$ $$\text{They are diagonally related in the periodic table, exhibiting similar properties.}$$ 8 / 50 Category: JAMB Chemistry 2014 8. $$\text{8. If the difference in electronegativity of elements P and Q is }3.0.\ \text{The bond that will be formed between them is}$$ a) $$\text{Metallic}$$ b) $$\text{Covalent}$$ c) $$\text{Coordinate}$$ d) $$\text{Ionic}$$ $$\text{A large electronegativity difference (>1.7) leads to an ionic bond.}$$ 9 / 50 Category: JAMB Chemistry 2014 9. $$\text{9. How many protons, neutrons, and electrons respectively are present in the element }^{60}_{27}\text{Co}?$$ a) $$27,\ 33,\ 33$$ b) $$33,\ 27,\ 27$$ c) $$27,\ 33,\ 27$$ d) $$60,\ 33,\ 60$$ $$\text{Atomic number = protons = 27; Neutrons = mass number – atomic number = 60 – 27 = 33; Electrons = 27 (neutral atom).}$$ 10 / 50 Category: JAMB Chemistry 2014 10. $$\text{10. The radioactive radiation used in studying the arrangement of particles in giant organic molecules is}$$ a) $$\gamma\text{-rays}$$ b) $$\alpha\text{-particles}$$ c) $$\text{X-rays}$$ d) $$\beta\text{-particles}$$ $$\text{X-rays are used in X-ray crystallography to study large molecules.}$$ 11 / 50 Category: JAMB Chemistry 2014 11. $$\text{11. A silicon-containing ore has }92\%\ ^{28}\text{Si},\ 5\%\ ^{29}\text{Si},\ \text{and }3\%\ ^{30}\text{Si}.\ \text{Calculate the relative atomic mass of the silicon.}$$ a) $$14.00$$ b) $$29.00$$ c) $$28.11$$ d) $$28.00$$ $$\text{Relative atomic mass }= (92 \times 28 + 5 \times 29 + 3 \times 30)/100 = 28.11.$$ 12 / 50 Category: JAMB Chemistry 2014 12. $$\text{12. The nitrogen obtained from air has a density higher than the one from nitrogen-containing compounds because the one from air is contaminated with}$$ a) $$\text{Water vapor}$$ b) $$\text{Oxygen}$$ c) $$\text{Rare gases}$$ d) $$\text{Carbon (IV) oxide}$$ $$\text{Air-derived nitrogen contains rare gases (argon, etc.), increasing density.}$$ 13 / 50 Category: JAMB Chemistry 2014 13. $$\text{13. Water is said to be temporarily hard when it contains}$$ a) $$\text{Ca(HCO}_3\text{)}_2\ \text{and}\ \text{Mg(HCO}_3\text{)}_2\ \text{salts}$$ b) $$\text{Ca(HCO}_3\text{)}_2\ \text{and}\ \text{CaCO}_3\ \text{salts}$$ c) $$\text{Mg(HCO}_3\text{)}_2\ \text{and}\ \text{CaSO}_4\ \text{salts}$$ d) $$\text{CaSO}_4\ \text{and}\ \text{Ca(HCO}_3\text{)}_2\ \text{salts}$$ $$\text{Temporary hardness is due to the presence of calcium and magnesium bicarbonates.}$$ 14 / 50 Category: JAMB Chemistry 2014 14. $$\text{14. On exposure to the atmosphere, a hydrated salt loses its water of crystallization to become anhydrous. This phenomenon is referred to as}$$ a) $$\text{Efflorescence}$$ b) $$\text{Deliquescence}$$ c) $$\text{Hygroscopy}$$ d) $$\text{Hydrolysis}$$ $$\text{Efflorescence is the loss of water of crystallization from a hydrated salt.}$$ 15 / 50 Category: JAMB Chemistry 2014 15. $$\text{15. }16.55\ \text{g of lead (II) trioxonitrate (V) was dissolved in }100\ \text{g of distilled water at }20^{\circ}\text{C}. \text{Calculate the solubility of the solute in mol dm}^{-3}.\ [\text{Pb}=207,\ \text{N}=14,\ \text{O}=16]$$ a) $$0.05\ \text{mol/dm}^3$$ b) $$2.00\ \text{mol/dm}^3$$ c) $$1.00\ \text{mol/dm}^3$$ d) $$0.50\ \text{mol/dm}^3$$ $$\text{Molar mass of Pb(NO}_3\text{)}_2 = 331\ \text{g/mol}. \text{Moles} = \frac{16.55}{331} = 0.05\ \text{mol}. \text{Solubility} = 0.05\ \text{mol/dm}^3.$$ 16 / 50 Category: JAMB Chemistry 2014 16. $$\text{16. The dispersion of a liquid in a liquid medium will give}$$ a) $$\text{An emulsion}$$ b) $$\text{A fog}$$ c) $$\text{A gel}$$ d) $$\text{An aerosol}$$ $$\text{A liquid-liquid colloidal system is called an emulsion.}$$ 17 / 50 Category: JAMB Chemistry 2014 17. $$\text{17. The major and most effective way of controlling pollution is to}$$ a) $$\text{Improve machinery so that substances released from combustion are less harmful}$$ b) $$\text{Pass strict laws against it by individuals and companies}$$ c) $$\text{Educate people on the causes and effects of pollution}$$ d) $$\text{Convert chemical wastes to harmless substances before releasing them into the environment}$$ $$\text{Converting chemical wastes to harmless substances minimizes environmental impact.}$$ 18 / 50 Category: JAMB Chemistry 2014 18. $$\text{18. The basicity of } \text{CH}_3\text{COOH is}$$ a) $$4$$ b) $$1$$ c) $$2$$ d) $$3$$ $$\text{Basicity is the number of replaceable hydrogen ions; acetic acid is monobasic (basicity = 1).}$$ 19 / 50 Category: JAMB Chemistry 2014 19. $$\text{19. The colour of litmus in a neutral medium is}$$ a) $$\text{Purple}$$ b) $$\text{Pink}$$ c) $$\text{Yellow}$$ d) $$\text{Orange}$$ $$\text{In neutral solutions, litmus paper is purple.}$$ 20 / 50 Category: JAMB Chemistry 2014 20. $$\text{20. The mathematical expression of pH is}$$ a) $$\log_{10}[\text{OH}^-]$$ b) $$\log_{10}\left(\frac{1}{[\text{H}_3\text{O}^+]}\right)$$ c) $$\log_{10}[\text{H}_3\text{O}^+]$$ d) $$\log_{10}\left(\frac{1}{[\text{OH}^-]}\right)$$ $$\text{pH} = -\log_{10}[\text{H}^+];\ \text{alternatively, } \text{pH} = \log_{10}\left(\frac{1}{[\text{H}_3\text{O}^+]}\right).$$ 21 / 50 Category: JAMB Chemistry 2014 21. $$\text{21. Which of the following salts will turn blue litmus red?}$$ a) $$\text{Sodium tetrahydroxozincate(II)}$$ b) $$\text{Potassium hydrogen tetraoxosulphate(IV)}$$ c) $$\text{Sodium trioxocarbonate(IV)}$$ d) $$\text{Zinc chloride hydroxide}$$ $$\text{Potassium hydrogen tetraoxosulphate(IV) is acidic, so it turns blue litmus red.}$$ 22 / 50 Category: JAMB Chemistry 2014 22. $$\text{22. }\text{Zn}(s) + \text{CuSO}_4(aq) \rightarrow \text{ZnSO}_4(aq) + \text{Cu}(s). \text{In the reaction above, the oxidation number of the reducing agent changes from}$$ a) $$0\ \text{to}\ +4$$ b) $$0\ \text{to}\ +2$$ c) $$+1\ \text{to}\ +2$$ d) $$+1\ \text{to}\ +3$$ $$\text{Zn goes from 0 to +2; it loses electrons and is oxidized, acting as reducing agent.}$$ 23 / 50 Category: JAMB Chemistry 2014 23. $$\text{23. }\text{H}_2\text{O}(g) + \text{C}(s) \rightarrow \text{H}_2(g) + \text{CO}(g). \text{The oxidizing agent in the reaction above is}$$ a) $$\text{CO}(g)$$ b) $$\text{C}(s)$$ c) $$\text{H}_2\text{O}(g)$$ d) $$\text{H}_2(g)$$ $$\text{H}_2\text{O} \text{ provides oxygen, accepting electrons; thus, it’s the oxidizing agent.}$$ 24 / 50 Category: JAMB Chemistry 2014 24. $$\text{24. Calculate the quantity of electricity in coulombs required to liberate }10\ \text{g of copper from a copper compound}.\ [\text{Cu}=64,\ F=96,500\ \text{C mol}^{-1}]$$ a) $$32,395.5$$ b) $$30,156.3$$ c) $$60,784.5$$ d) $$15,196.5$$ $$\text{Moles of Cu} = \frac{10}{64} = 0.15625\ \text{mol}. \text{Cu}^{2+} + 2e^- \rightarrow \text{Cu}; Q = n \times F \times 2 = 0.15625 \times 96,500 \times 2 = 30,156.25\ \text{C}.$$ 25 / 50 Category: JAMB Chemistry 2014 25. $$\text{25. How many faradays of electricity are required to produce }0.25\ \text{mol of copper}?$$ a) $$1.00\ F$$ b) $$0.01\ F$$ c) $$0.05\ F$$ d) $$0.50\ F$$ $$\text{Cu}^{2+} + 2e^- \rightarrow \text{Cu}; \text{Faradays} = \text{moles} \times \text{number of electrons} = 0.25 \times 2 = 0.5\ F.$$ 26 / 50 Category: JAMB Chemistry 2014 26. $$\text{26. In the diagram below, Z represents…}$$ a) $$\text{Heat of reaction}$$ b) $$\text{Activation energy}$$ c) $$\text{Free energy}$$ d) $$\text{Entropy of reaction}$$ $$\text{Z indicates the activation energy of the reaction.}$$ 27 / 50 Category: JAMB Chemistry 2014 27. $$\text{27. If the change in free energy of a system is }-899\ \text{J mol}^{-1}\ \text{and the entropy change is }10\ \text{J mol}^{-1}\text{K}^{-1}\ \text{at }25^{\circ}\text{C},\ \text{calculate the enthalpy change.}$$ a) $$+2081\ \text{J mol}^{-1}$$ b) $$-2081\ \text{J mol}^{-1}$$ c) $$-649\ \text{J mol}^{-1}$$ d) $$+649\ \text{J mol}^{-1}$$ $$\Delta G = \Delta H – T\Delta S; \Delta H = \Delta G + T\Delta S = -899 + (298 \times 10) = -899 + 2980 = +2081\ \text{J mol}^{-1}.$$ 28 / 50 Category: JAMB Chemistry 2014 28. $$\text{28. In an equilibrium reaction, which of the following conditions indicates that maximum yield of the product will be obtained?}$$ a) $$\text{Equilibrium constant is very large}$$ b) $$\Delta H – T\Delta S = 0$$ c) $$\Delta H > T\Delta S$$ d) $$\text{Equilibrium constant is less than zero}$$ $$\text{A very large equilibrium constant means products are favored at equilibrium.}$$ 29 / 50 Category: JAMB Chemistry 2014 29. $$\text{29. In a chemical reaction, the change in concentration of a reactant with time is}$$ a) $$\text{Enthalpy of reaction}$$ b) $$\text{Rate of reaction}$$ c) $$\text{Order of reaction}$$ d) $$\text{Entropy of reaction}$$ $$\text{The rate of reaction is defined as the change in concentration over time.}$$ 30 / 50 Category: JAMB Chemistry 2014 30. $$\text{30. }2\text{CrO}_4^{2-}(aq) + 2\text{H}^+(aq) \leftrightarrows \text{Cr}_2\text{O}_7^{2-}(aq) + \text{H}_2\text{O}(l). \text{What happens to the reaction above when the hydrogen ion concentration is increased?}$$ a) $$\text{More of the products will be formed}$$ b) $$\text{The reaction will not proceed}$$ c) $$\text{The equilibrium position will shift to the right}$$ d) $$\text{The equilibrium position will shift to the left}$$ $$\text{According to Le Chatelier’s principle, increasing }[\text{H}^+]\ \text{shifts equilibrium to the right, forming more } \text{Cr}_2\text{O}_7^{2-}.$$ 31 / 50 Category: JAMB Chemistry 2014 31. $$\text{31. Which of the following will liberate hydrogen from dilute tetraoxosulphate(VI) acid?}$$ a) $$\text{Lead}$$ b) $$\text{Magnesium}$$ c) $$\text{Copper}$$ d) $$\text{Gold}$$ $$\text{Magnesium is above hydrogen in the reactivity series and will displace hydrogen from acids.}$$ 32 / 50 Category: JAMB Chemistry 2014 32. $$\text{32. In the laboratory preparation of ammonia, the flask is placed in a slanting position so as to}$$ a) $$\text{Prevent condensed water from breaking the reaction flask}$$ b) $$\text{Enable the proper mixing of the reactants in the flask}$$ c) $$\text{Enhance the speed of the reaction}$$ d) $$\text{Prevent formation of precipitate}$$ $$\text{This prevents condensed water from flowing back and cracking the hot flask.}$$ 33 / 50 Category: JAMB Chemistry 2014 33. $$\text{33. Which of these gases is employed as an anesthetic?}$$ a) $$\text{N}_2\text{O}$$ b) $$\text{NO}_2$$ c) $$\text{NH}_3$$ d) $$\text{NO}$$ $$\text{Nitrous oxide (N}_2\text{O}) is used as an anesthetic.}$$ 34 / 50 Category: JAMB Chemistry 2014 34. $$\text{34. Sulphur(IV) oxide is a strong reducing agent in the presence of water due to the formation of}$$ a) $$\text{Hydroxide ion}$$ b) $$\text{Sulphur(VI) oxide}$$ c) $$\text{Hydrogen sulphide}$$ d) $$\text{Trioxosulphate(IV) salt}$$ $$\text{It forms trioxosulphate(IV) ions (HSO}_3^{-}), which can act as reducing agents.}$$ 35 / 50 Category: JAMB Chemistry 2014 35. $$\text{35. A metal that forms soluble trioxosulphate(IV) ion is}$$ a) $$\text{Barium}$$ b) $$\text{Potassium}$$ c) $$\text{Manganese}$$ d) $$\text{Aluminum}$$ $$\text{Potassium forms soluble sulphites (trioxosulphate(IV) salts).}$$ 36 / 50 Category: JAMB Chemistry 2014 36. $$\text{36. Copper is displaced from the solution of its salts by most metals because it}$$ a) $$\text{Is a transition element}$$ b) $$\text{Is at the bottom of the activity series}$$ c) $$\text{Is very reactive}$$ d) $$\text{Has completely filled 3d orbitals}$$ $$\text{Copper is less reactive and is lower in the activity series than many metals.}$$ 37 / 50 Category: JAMB Chemistry 2014 37. $$\text{37. The colored nature of transition metal ions is associated with their partially filled}$$ a) $$\text{f-orbital}$$ b) $$\text{s-orbital}$$ c) $$\text{p-orbital}$$ d) $$\text{d-orbital}$$ $$\text{Partially filled d-orbitals allow for d-d electronic transitions, causing color.}$$ 38 / 50 Category: JAMB Chemistry 2014 38. $$\text{38. Aluminum containers are frequently used to transport trioxonitrate(V) acid because aluminum}$$ a) $$\text{Has a silvery-white appearance}$$ b) $$\text{Has a low density}$$ c) $$\text{Does not react with the acid}$$ d) $$\text{Does not corrode}$$ $$\text{Aluminum forms a protective oxide layer, preventing reaction with the acid.}$$ 39 / 50 Category: JAMB Chemistry 2014 39. $$\text{39. }2\text{-methylbutan-2-ol}\ \text{is an example of a}$$ a) $$\text{Dihydric alkanol}$$ b) $$\text{Tertiary alkanol}$$ c) $$\text{Secondary alkanol}$$ d) $$\text{Primary alkanol}$$ $$\text{It is a tertiary alkanol because the hydroxyl group is attached to a tertiary carbon.}$$ 40 / 50 Category: JAMB Chemistry 2014 40. $$\text{40. The reaction between ammonia and ethyl ethanoate produces}$$ a) $$\text{Propanol and ethanamide}$$ b) $$\text{Propanol and propanamide}$$ c) $$\text{Ethanol and propanamide}$$ d) $$\text{Ethanol and ethanamide}$$ $$\text{Ammonolysis of an ester yields ethanol and ethanamide.}$$ 41 / 50 Category: JAMB Chemistry 2014 41. $$\text{41. The decarboxylation of ethanoic acid will produce carbon(IV) oxide and}$$ a) $$\text{Methane}$$ b) $$\text{Ethane}$$ c) $$\text{Propane}$$ d) $$\text{Butane}$$ $$\text{Decarboxylation removes CO}_2,\ \text{yielding methane from ethanoic acid.}$$ 42 / 50 Category: JAMB Chemistry 2014 42. $$\text{42. }\text{The compound above is an}$$ a) $$\text{Alkanal}$$ b) $$\text{Alkanone}$$ c) $$\text{Alkanoate}$$ d) $$\text{Alkanol}$$ $$\text{Based on the structure (CHO group), it is an alkanal (aldehyde).}$$ 43 / 50 Category: JAMB Chemistry 2014 43. $$\text{43. The compound that will react with sodium hydroxide to form salt and water is}$$ a) $$\text{C}_6\text{H}_{12}\text{O}_6$$ b) $$\text{(CH}_3\text{)}_3\text{COH}$$ c) $$\text{CH}_3\text{CH=CH}_2$$ d) $$\text{CH}_3\text{CH}_2\text{COOH}$$ $$\text{Carboxylic acids react with bases to form salt and water; propanoic acid fits.}$$ 44 / 50 Category: JAMB Chemistry 2014 44. $$\text{44. Which of the following compounds in solution will turn red litmus paper blue?}$$ a) $$\text{C}_2\text{H}_5\text{OH}$$ b) $$\text{CH}_3\text{COOH}$$ c) $$\text{CH}_3\text{NH}_2$$ d) $$\text{C}_6\text{H}_{12}$$ $$\text{An amine (organic base) will turn red litmus blue; option C is an amine.}$$ 45 / 50 Category: JAMB Chemistry 2014 45. $$\text{45. The dehydration of ammonium salts of alkanoic acids produces a compound with the general formula}$$ a) $$\text{RCOOR'}$$ b) $$\text{RCONH}_2$$ c) $$\text{RCN}$$ d) $$\text{ROH}$$ $$\text{Dehydration of ammonium alkanoates yields amides: RCONH}_2.$$ 46 / 50 Category: JAMB Chemistry 2014 46. $$\text{46. Which of the following fractions is used as raw material for the cracking process?}$$ a) $$\text{Kerosene}$$ b) $$\text{Lubricating oil}$$ c) $$\text{Bitumen}$$ d) $$\text{Diesel oils}$$ $$\text{Lubricating oil fractions are often used in cracking to produce smaller alkanes and alkenes.}$$ 47 / 50 Category: JAMB Chemistry 2014 47. $$\text{47. An organic compound with a pleasant smell is likely to have a general formula}$$ a) $$\text{C}_n\text{H}_{2n+1}\text{CHO}$$ b) $$\text{C}_n\text{H}_{2n+1}\text{COOH}$$ c) $$\text{C}_n\text{H}_{2n+1}\text{COO}\text{C}_n\text{H}_{2n+1}$$ d) $$\text{C}_n\text{H}_{2n+1}\text{COC}_n\text{H}_{2n+1}$$ $$\text{Esters (RCOOR’) have fruity smells and the general formula C}_n\text{H}_{2n+1}\text{COO}\text{C}_n\text{H}_{2n+1}.$$ 48 / 50 Category: JAMB Chemistry 2014 48. $$\text{48. A primary amide is generally represented by the formula}$$ a) $$\text{RCOOR}$$ b) $$\text{RCONH}_2$$ c) $$\text{RCONHR}$$ d) $$\text{RCONR}_2$$ $$\text{Primary amide has the formula RCONH}_2.$$ 49 / 50 Category: JAMB Chemistry 2014 49. $$\text{49. The IUPAC nomenclature for the compound above is}$$ a) $$\text{2-bromo-3-chlorobutanol}$$ b) $$\text{3-bromo-2-chlorobutanol}$$ c) $$\text{3-chloro-2-bromobutanol}$$ d) $$\text{2-chloro-3-bromobutanol}$$ $$\text{The compound is 2-chloro-3-bromobutanol, numbering gives lowest locants.}$$ 50 / 50 Category: JAMB Chemistry 2014 50. $$\text{50. An organic compound contains }60\%\ \text{carbon},\ 13.3\%\ \text{hydrogen},\ \text{and }26.7\%\ \text{oxygen}. \text{Calculate the empirical formula.}\ [\text{C}=12,\ \text{H}=1,\ \text{O}=16]$$ a) $$\text{C}_5\text{H}_{12}\text{O}$$ b) $$\text{C}_3\text{H}_8\text{O}$$ c) $$\text{C}_6\text{H}_{13}\text{O}_2$$ d) $$\text{C}_4\text{H}_9\text{O}$$ $$\text{Calculate moles: C (60/12)=5, H (13.3/1)=13.3, O (26.7/16)=1.67; Divide by smallest to get ratios: C_3H_8O.$$ Your score is The average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz Anonymous feedback Send feedback
