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111) Which of the following has the greatest mass? A)

Question : 111) Which of the following has the greatest mass? A) : 1403208

 

 

111) Which of the following has the greatest mass?

A) 3.88 × 1022 molecules of O2

B) 1.00 g of O2

C) 0.0312 mol of O2

D) All of the above have the same mass.

112) Which of the following has the smallest mass?

A) 3.50 × 1023 molecules of I2

B) 85.0 g of Cl2

C) 2.50 mol of F2

D) 0.050 kg of Br2

 

113) The molecular weight of nitrous oxide ( N2O ), known as laughing gas, is ________ amu (rounded to one decimal place).

A) 60.0

B) 30.0

C) 44.0

D) 3.0

E) 22.0

 

114) A sample of pure lithium nitrate contains 10.1% lithium by mass. What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the first sample?

A) 5.05%

B) 10.1%

C) 20.2%

D) 40.4%

 

115) A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 40.0 g of calcium fluoride?

A) 2.27 g

B) 7.70 g

C) 15.0 g

D) 20.5 g

116) Which one of the following contains 39% carbon by mass?

A) C2H2

B) CH4

C) CH3NH2

D) CO2

 

117) Determine the mass percent (to the hundredths place) of H in sodium bicarbonate (NaHCO3).

 

118) What is the empirical formula of a compound that is 62.0% C, 10.4% H, and 27.5% O by mass?

A) C3HO

B) C6HO3

C) C6H12O2

D) C5H10O2

E) C3H6O

 

119) How many Fe(II) ions are there in 20.0 g of FeSO4?

A) 2.19 × 10-25 iron(II) ions

B) 7.92 × 1022 iron(II) ions

C) 4.57 × 1024 iron(II) ions

D) 1.82 × 1027 iron(II) ions

120) How many oxygen atoms are there in 7.00 g of sodium dichromate, Na2Cr2O7?

A) 0.187 oxygen atoms

B) 2.30 × 1021 oxygen atoms

C) 1.60 × 1022 oxygen atoms

D) 1.13 × 1023 oxygen atoms

 

 

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