32) A molecule has an empirical formula of CHO2 and a molar mass of 90 g/mol. Wh

Question

32) A molecule has an empirical formula of CHO2 and a molar mass of 90 g/mol. What is the molecular formula? 33) Under what conditions would a gas be least soluble in a liquid? A) high temperature and low pressure C) low temperature and high pressure B) low temperature and low pressure D) high temperature and high pressure 34) Which of the following is soluble in water? A) octane, CgH18 B) ethanol, C2H5OH C) iodine, I D) strontium sulfate, SrSO4 E) all of these are soluble in water 35) Name the following alkane CH3-CH CH CH2-CH3 B) 3,4-dimethylpentane C) 2 D) 2 E) none of the above CH3 CH3 36) What class of compound is the following: CH3-CH2-OCH3? A) amine B) aldehyde C) organic halide D) ether E) alcohol 37) Which of the following structural formulas is an isomer to octane? CHs-CH-CH2 CH-CH A) CH3 H,-CH,-CH-CH3 B) -CH3 CH3 2-CH2 c) CH3 CH3 CH3-CH2-CH2 CH2-CH CH3 D) CH3 E) none of the above

Explanation / Answer

Ans 32 : E) C2H2O4

The empirical mass of the compound = 12 + 1 + 32 = 45 g/mol

The molar mass of the compound = 90 g/mol

Dividing the molar mass by the empirical mass : 90 / 45 = 2

So the molecular formula of the compound = 2 (CHO2)

= C2H2O4

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