5. To determine the formula of a new substance, one of the first steps is to find the
a. gram formula mass
c. value for Avogadro's number
b. number of particles per mole
d. percent composition
6. What is the percent by mass of carbon in acetone, C3H6O?
a. 1.61%
b. 62.10%
C. 30.00%
d. 20.70%
7. If 60.2 grams of Hg combines completely with 24.0 grams of Br to form a
compound, what is the percent composition of Hg in the compound?
a. 71.50%
b. 251%
c. 60.10%
d. 39.90%
8. What is the percent composition of chromium in BaCrO4?
a. 9.47%
b.20.50%
c.54.20%
d.25.20%
9. What is the mass of oxygen in 250 g of sulfuric acid, H2SO4?
a. 16 g
c.3.9 g
d.163 g
10. What is the percentage composition of Br in a 14.80g sample that contains
10.97g of Bromine?
a. Br=25.9%
b. Br=19.8% c. Br=74.1%
d. Br=80.2%
b. 41 g
a. gram formula mass
c. value for Avogadro's number
b. number of particles per mole
d. percent composition
6. What is the percent by mass of carbon in acetone, C3H6O?
a. 1.61%
b. 62.10%
C. 30.00%
d. 20.70%
7. If 60.2 grams of Hg combines completely with 24.0 grams of Br to form a
compound, what is the percent composition of Hg in the compound?
a. 71.50%
b. 251%
c. 60.10%
d. 39.90%
8. What is the percent composition of chromium in BaCrO4?
a. 9.47%
b.20.50%
c.54.20%
d.25.20%
9. What is the mass of oxygen in 250 g of sulfuric acid, H2SO4?
a. 16 g
c.3.9 g
d.163 g
10. What is the percentage composition of Br in a 14.80g sample that contains
10.97g of Bromine?
a. Br=25.9%
b. Br=19.8% c. Br=74.1%
d. Br=80.2%
b. 41 g
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Answer:
5.a. gram formula mass
6.b. 62.10%
62.10% is the percent by mass of carbon in acetone
7.a. 71.50%
the percent composition of Hg in the compound is 71.50%.
8.b.25.50%
The percent composition for chromium in BaCrO4, commonly called barium chromate, is 20.50 percent.
9.d.163 g
The mass of the oxygen atoms in a 250-gram sample of sulfuric acid with a chemical formula of H2 SO4 is 163.125 grams
10.a.Br=25.9%