Chemistry Chapter 9 Which The Following Compounds Has Its Nitrogen

138) An iron oxide is 70.0% in iron. Its empirical formula is ________.

A) FeO

B) Fe2O

C) Fe2O3

D) Fe3O4

139) Which of the following compounds is expected to have oxygen?

A) compound W: %C= 40.2% ; H= 6.8%; N= 10.3%; S= 19.2%

B) compound X: %C= 52.3% ; H= 4.1%; Br= 30.4%; S= 13.2%

C) compound Y: %C= 25.6% ; H= 8.8%; I= 45.3%; N= 20.2%

D) compound Z: %C= 48.1% ; H= 8.6%; F= 28.2%; P= 15.0%

140) A certain compound is found to contain 1.45 g of Na, 2.05 g of S and 1.5 g of O. Its

empirical formula is ________.

A) Na2SO

B) NaS2O

C) Na2S2O3

D) NaSO2

141) 0.540 g of bromine combine with 0.858 g of iodine to yield a compound X. The empirical

formula of the compound described above is ________.

A) Br2I

B) BrI2

C) Br2I3

D) BrI

142) A compound has the following elemental composition: C = 58.8%, H= 13.8%, N = 27.4%.

The empirical formula of this compound is ________.

A) C5H14N

B) C5H10N2

C) C5H14N2

D) C5H15N2

143) The empirical formula for a compound that is 48.7% C, 13.6% H and 37.8% N is

________.

A) C4H9N2

B) C3H8N

C) C3H10N2

D) C4H10N

144) If the empirical formula is CH2, and the molecular weight is equal to 180 ±10, then the

molecular formula is ________.

A) C6H12O6

B) C14H21

C) C8H12O4

D) C13H26

145) Hydrazine contains 87.5% nitrogen and 12.5% hydrogen. If the molecular mass is 32 ± 6,

the molecular formula is ________.

A) N2H

B) N2H2

C) N2H3

D) N2H4

146) A 4.000 g sample of a certain cobalt oxide contains 2.937 g of cobalt. The empirical

formula is ________.

A) CoO

B) CoO2

C) Co2O

D) Co3O4

147) A selenium-chlorine compound is 35.7% in selenium. Its empirical formula is ________.

A) SeCl

B) SeCl2

C) SeCl3

D) SeCl4

148) 0.68 g of sulfur combine with 1.51 g of chlorine. The empirical formula of this compound is

________.

A) SCl

B) SCl2

C) SCl4

D) SCl6

149) The element in C7H5NO3 whose % composition is 31.8% is ________.

A) carbon

B) hydrogen

C) nitrogen

D) oxygen

150) What is the percentage by mass of iron (Fe) in the mineral hematite (Fe2O3)?

A) 40%

B) 60%

C) 70%

D) 30%

151) What is the percentage by mass of hydrogen in ordinary water (H2O)?

A) 20%

B) 11%

C) 60%

D) 40%

152) Methanol (CH4O) weighs 32 g/mol. What is the mass percentage of carbon in methanol?

A) 63%

B) 50%

C) 20%

D) 38%

153) Ilmenite (FeTiO3) is the primary ore from which the element titanium (Ti) is isolated. What

is the percentage of titanium by mass in this mineral?

A) 20%

B) 32%

C) 80%

D) 68%

154) Which contains the highest percentage of oxygen?

A) H2O2

B) Na2O2

C) HgO

D) CO2

155) Which contains the least percentage of oxygen?

A) H2O2

B) Na2O2

C) HgO

D) CO2

156) Which contains the highest percentage of hydrogen?

A) HCl

B) H2SO4

C) H3PO4

D) H2O

157) Which contains the lowest percentage of hydrogen?

A) HCl

B) H2SO4

C) H3PO4

D) H2O

158) Which of the following compounds has its carbon composition equal to 52.1%?

A) C2H6O

B) CH3Cl

C) C4H8O2N2S

D) C10H20O4N2S

159) Which of the following compounds has its hydrogen composition equal to 2.4%?

A) C4H7Cl

B) CH2Cl2

C) C2H3NO2

D) C10H20ONS

160) Which of the following compounds has its oxygen composition equal to 50.0%?

A) (NH4)2CO3

B) CH2O2

C) C2H3NO2

D) C10H20ONS

161) Which of the following compounds has its nitrogen composition equal to 29.2%?

A) C2H3NO2

B) C10H20ONS

C) (NH4)2CO3

D) N2H4

162) Which of the following compounds has its chlorine composition equal to 83.5%?

A) C2H3ClO2

B) C10H17ClS

C) CCl4

D) CH2Cl2

163) Which of the following compounds has its sulfur composition equal to 18.6%?

A) C6H8SO2N2

B) C7H14S

C) CH2SO2

D) COS

164) Which of the following compounds has its combined carbon and hydrogen composition

equal to 37.0%?

A) C4H7Cl

B) CH2O2

C) C2H3NO2

D) C10H20ONS

165) Which of the following compounds has its combined carbon and oxygen composition equal

to 76.7%?

A) C4H7Cl

B) CH2O2

C) C2H3NO2

D) C10H20ONS

166) Which of the following has the highest percent of oxygen?

A) N2O

B) Al2O3

C) K2CO3

D) KMnO4

167) Which of the following has the lowest percent of oxygen?

A) N2O

B) Al2O3

C) K2CO3

D) KMnO4

168) Which of the following percent compositions does not correspond to one of the elements of

NaNO3?

A) 56.4%

B) 19.4%

C) 16.5 %

D) 27.1%

169) Which of the following percentage compositions does not correspond to one of the

elements of C6H12O6?

A) 43.4%

B) 40.0%

C) 6.7%

D) 53.3%

170) Which of the following percentage compositions does not correspond to one of the

elements of C9H8O4?

A) 4%

B) 26%

C) 36%

D) 60%

171) 0.540 g of bromine combine with 0.858 g of iodine to yield a compound X. Its percent

composition is ________.

A) Br = 38.6%, I = 61.4%

B) Br = 61.3%, I = 38.6%

C) Br = 32.8%, I = 67.2%

D) Br = 67.2%, I = 32.8%

172) What is the mass percent of Sn in tin (IV) oxide?

A) 26.96%

B) 64.97%

C) 78.77%

D) 93.69%

E) 96.73%

1) One mole of oxygen gas has fewer atoms than one mole of ozone gas.

2) One molecule of oxygen gas has fewer atoms than one mole of ozone gas.

3) One mole of methane has the same mass as one mole of oxygen gas.

4) One mole of methane has approximately the same mass as half a mole of oxygen gas.

5) One mole of carbon monoxide has the same mass as one mole of nitrogen gas.

6) The number of molecules of a certain mass of any compound is always higher than the

number of moles of the same compound.

7) The number of atoms of a certain mass of any compound may be lower than the number of

molecules of the same compound.

8) The number of atoms in one formula unit of (NH4)2Cr2O7 is 17.

9) K4Fe(CN)6 and Al2(SO4)3 have the same number of atoms per formula unit.

10) K4Fe(CNO)6 has more atoms per formula unit than Al(C3H5O2)3.

11) (NH4)4Fe(CNO)6 has 36 atoms per formula unit.