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How many formula units are in a sample of rust, Fe2O3 that has a mass of

How many formula units are in a sample of rust, Fe2O3 that has a mass of

How many formula units are in a sample of rust, Fe2O3, that has a mass of 5.0 g?

A)  1.9 ? 1025    B)  0.031    C)  1.9 ? 1022    D)  0.070    E)  4.2 ? 1022

 

62.              How many molecules are in a sample of water, H2O, that has a mass of 50.0 g?

A)1.67 ? 1024 moleculesD)3.01 ? 1025 molecules

B)5.42 ? 1026 moleculesE)8.30 ? 10–23 molecules

C)2.16 ? 1023 molecules

 

63.              How many formula units are in a sample of NaCl that has a mass of 175 g?

A)2.01 ? 1023 formula unitsD)1.05 ? 1026 formula units

B)1.80 ? 1024 formula unitsE)2.91 ? 10–22 formula units

C)6.16 ? 1027 formula units

 

64.              How many moles are in a sample of ethanol, CH3CH2OH, that has a volume of 100.0 mL?  The molar mass and density of ethanol are 46.07 g/mol and 0.789 g/mL, respectively.

A)  78.9 mol    B)  1.71 mol    C)  36.3 mol    D)  2.75 mol    E)  0.504 mol

 

65.              How many moles are in a sample of ethylene glycol (commonly found in antifreeze), HOCH2CH2OH, that has a volume of 250.0 mL?  The molar mass and density of ethylene glycol are 62.07 g/mol and 1.11 g/mL, respectively.

A)4.47 molD)1.40 ? 104 mol

B)0.276 molE)1.72 ? 104 mol

C)3.63 mol

 

66.              How many oxygen atoms are in 75.0 g of SO3?

A)225 atomsD)1.69 ? 1024 atoms

B)0.937 atomsE)4.52 ? 1025 atoms

C)5.64 ? 1023 atoms

 

67.              How many hydrogen atoms are in 135 g of H2O?

A)170 atomsD)8.04 ? 1022 atoms

B)4.51 ? 1024 atomsE)2.49 ? 10–23 atoms

C)9.02 ? 1024 atoms

 

68.              How many sodium ions are in 125 g of Na2SO4?

A)1.06 ? 1024 atomsD)1.37 ? 1024 atoms

B)5.30 ? 1023 atomsE)1.46 ? 10–24 atoms

C)6.84 ? 1023 atoms

 

69.              How many nitrate ions are in 75.0 g of Zn(NO3)2?

A)0.396 atomsD)4.77 ? 1023 atoms

B)0.792 atomsE)6.57 ? 10–25 atoms

C)2.38 ? 1023 atoms

 

70.              Rank the following compounds in order from least nitrogen atoms to most nitrogen atoms in a 50.0 g sample:  N2, N2O5, NH3, NH4Cl

A)N2O4ClD)NH4Cl 2O5

B)N2O4Cl 2E)NH4Cl 2O5

C)N4Cl 2O5

abhinav behal 15-Feb-2020

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