1. Which one of the following samples has the greatest mass? A.10.0 mol of krypt

Question

1.

Which one of the following samples has the greatest mass?

A.10.0 mol of krypton, Kr

B.5.0 mol of ammonia, NH3

C.0.30 mol of camphor, C10H16O

D.4.0 mol of iodine vapor, I2

E.2.5 mol of formaldehyde, CH2O

2.

Pure copper may be produced by the reaction of copper(I) sulfide with oxygen gas as follows:

Cu2S(s) + O2(g)    2Cu(s) + SO2(g)

If the reaction of 0.500 kg of copper(I) sulfide with excess oxygen produces 0.100 kg of copper metal, what is the percent yield?

A.39.9 %

B.100 %

C.50.1 %

D.20.0 %

E.25.0 %

3.

Which net ionic equation best represents the reaction that occurs when an aqueous solution of potassium nitrate is mixed with an aqueous solution of ammonium chloride?

A.K+(aq) + Cl–(aq) KCl(s)

B.NH4Cl(aq) + KNO3(aq) KCl(s) + NH4NO3(aq)

C.K+(aq) + NH4Cl(aq) KCl(s) + NH4+(aq)

D.NH4+(aq) + NO3–(aq) NH4NO3(aq)

E.No net reaction occurs.

4.

Which of the following reactions involves neither oxidation nor reduction?

A.C2H4(g) + H2(g) C2H6(g)

B.NH4NO2(s) N2(g) + 2H2O(l)

C.N2(g) + 3H2(g) 2NH3(g)

D.Cu(s) + 2Ag+(aq) Cu2+(aq) + 2Ag(s)

E.2CrO42–(aq) + 2H+(aq) Cr2O72–(aq) + H2O(l)

Explanation / Answer

1) D. 4.0 mol of iodine vapor, I2

2) the percent yield = 24.7%

3) B.   NH4Cl(aq) + KNO3(aq) KCl(s) + NH4NO3(aq)

4) E.   2CrO42–(aq) + 2H+(aq) Cr2O72–(aq) + H2O(l)

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