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A 50.0 g sample of a compound contains 1023 molecules Which of the following could be this compound

 A 50.0 g sample of a compound contains 2.20 ? 1023 molecules.  Which of the following could be this compound?

A)  PH3    B)  NH3    C)  PCl3    D)  PCl5    E)  NF3

 

42.              A 100.0 g sample of a compound contains 1.37 ? 1024 molecules.  Which of the following could be this compound?

A)  CO2    B)  NH3    C)  CH4    D)  CCl4    E)  CF4

 

43.              If the molar mass of a substance is 34.1 g/mol, what is the mass of 3.01 ? 1024 molecules of the substance?

A)  17.1 g    B)  6.82 g    C)  8.83 ? 1022 g    D)  1.03 ? 1024 g    E)  1.70 ? 102 g

 

44.              If the molar mass of a substance is 20.0 g/mol, what is the mass of 3.01 ? 1025 molecules of the substance?

A)  0.400 g    B)  10.0 g    C)  1.00 ? 103 g    D)  6.02 ? 1026 g    E)  1.20 ? 1025 g

 

45.              If the molar mass of a substance is 20.0 g/mol, what is the mass of 4.01 ? 1023 molecules of the substance?

A)  30.0 g    B)  13.3 g    C)  8.02 ? 1024 g    D)  1.20 ? 1025 g    E)  3.00 g

 

46.              If the molar mass of a substance is 44.01 g/mol, what is the mass of 1.05 ? 1024 molecules of the substance?

A)  76.7 g    B)  1.74 g    C)  4.62 ? 1025 g    D)  4.19 ? 10–23 g    E)  25.2 g

 

47.              Calculate the number of moles of NaHCO3 (sodium bicarbonate, or baking soda) in a 5.0 g sample of this substance.

A)0.096 moleD)3.6 ? 1022 moles

B)0.060 moleE)2.8 ? 1023 mole

C)420 moles

 

48.              Calculate the number of moles of NaOH (sodium hydroxide, an ingredient in drain cleaners and oven cleaners) in a 10.0 g sample of this substance.

A)1.51 ? 1023 molesD)4.00 ? 102 moles

B)1.66 ? 1023 moleE)0.250 mole

C)0.208 mole

 

49.              Calculate the number of moles of CaCO3 (calcium carbonate, or limestone) in a 20.0 g sample of this substance.

A)2.00 ? 103 molesD)1.36 ? 103 moles

B)0.200 moleE)1.20 ? 103 moles

C)0.294 mole

 

50.              Calculate the moles of sucrose, C12H22O11, in a 15.0-g sample of this substance.

A)342 molD)4.38 ? 10–2 mol

B)22.8 molE)0.517 mol

C)5.13 ? 103 mol

Feb 15 2020 Read more Less More

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