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Question : 31) How many moles of carbon monoxide there in 36.55

31) How many moles of carbon monoxide are there in 36.55 g of carbon monoxide?

A) 0.8452

B) 1.305

C) 0.9291

D) 2.589

E) 3.046

32) How many moles of carbon dioxide are there in 52.06 g of carbon dioxide?

A) 0.8452

B) 1.183

C) 6.022 × 1023

D) 8.648 × 1023

E) 3.134 × 1025

33) There are __________ molecules of methane in 0.123 mol of methane (CH4).

A) 5

B) 2.46 × 10-2

C) 2.04 × 10-25

D) 7.40 × 1022

E) 0.615

34) What is the empirical formula of a compound that contains 27.0% S, 13.4% O, and 59.6% Cl by mass?

A) SOCl

B) SOCl2

C) S2OCl

D) SO2Cl

E) ClSO4

35) What is the empirical formula of a compound that contains 29% Na, 41% S, and 30% O by mass?

A) Na2S2O3

B) NaSO2

C) NaSO

D) NaSO34

E) Na2S2O6

36) What is the empirical formula of a compound that contains 49.4% K, 20.3% S, and 30.3% O by mass?

A) KSO2

B) KSO3

C) K2SO4

D) K2O3

E) KSO4

37) A compound contains 40.0% C, 6.71% H, and 53.29% O by mass. The molecular weight of the compound is 60.05 amu. The molecular formula of this compound is __________.

A) C2H4O2

B) C H2O

C) C2H3O4

D) C2H2O4

E) CHO2

38) A compound that is composed of carbon, hydrogen, and oxygen contains 70.6% C, 5.9% H, and 23.5% O by mass. The molecular weight of the compound is 136 amu.  What is the molecular formula?

A) C8H8O2

B) C8H4O

C) C4H4O

D) C9H12O

E) C5H6O2

39) A compound that is composed of only carbon and hydrogen contains 85.7% C and 14.3% H by mass. What is the empirical formula of the compound?

A) CH2

B) C2H4

C) C H42

D) C4H8

E) C86H14

40) A compound that is composed of only carbon and hydrogen contains 80.0% C and 20.0% H by mass. What is the empirical formula of the compound?

A) C20H60

B) C7H20

C) C H3

D) C2H6

E) CH4

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