MOL CONCEPT QUIZ Part II

1. What is the total number of moles of sulfur atoms in 1 mole of Fe2(SO4)3?
a. 1
b. 3
c. 7
d. 15
e. 17
2. What is the total number of moles of all atoms in 1 mole of (NH4)2SO4?
a. 1
b. 3
c. 7
d. 15
e. 17
3. Which sample contains a total of 6.0 x 1023 atoms?
a. 23 g Na (Ar 23)
b. 24 g Ca (Ar 40)
c. 42 g K (Ar 39)
d. 44 g F (Ar 19)
e. 78 g Cl (Ar 35.5)
4. The molar mass of carbon is 12 g/mol. If the Avogadro’s numbers are 6 x 1023, the mass in grams of a carbon atom is ...
a. 2x10 -23
b. 1,2x10 -23
c. 10 -23
d. 1,2x10 23
e. 2x10 23
5. The molar mass of oxygen is 16 g/mol. If the Avogadro’s numbers are 6 x 1023, the mass in grams of an oxygen atom is
a. 2x10 -23
b. 2,7x10 -23
c. 10 -23
d. 1,2x10 23
e. 2x10 23
6. The formula of an acid is H2XO6. The mass of 0.0102 moles of the acid is 2.301 g. What is the atomic weight of X? (Ar O = 16.00, H = 1.008).
a. 128
b. 79.0
c. 35.5
d. 28.1
e. 11.5
7. The formula of an acid is HXO2. The mass of 0.0242 moles of the acid is 1.657 g. What is the atomic weight of X? (Ar O = 16.00, H = 1.008).
a. 35.5
b. 28.1
c. 128
d. 19.0
e. 79.9
8. Vitamin B2 which contains carbon, hydrogen, nitrogen and oxygen is 14.9% nitrogen by mass. There are four nitrogen atoms per molecule. What is the molecular weight of vitamin B2? (Ar C = 12, O = 16, H = 1, N = 14).
a. 1504
b. 376
c. 352
d. 312
e. 94
9. Cocaine, an addictive drug, is 4.62% nitrogen. There is one nitrogen atoms per molecule. What is the molecular weight of cocaine? (Ar N = 14.00).
a. 312
b. 308
c. 303
d. 300
e. 295
10. Hydrogen cyanide, HCN is a volatile, colorless liquid with the odor of certain fruit pits. The compound is highly poisonous. The number of molecules in 54 mg HCN (Mr = 54), the everage toxic dose are ….
a. 6,02 x 1020
b. 1023
c. 6,02 x 1023
d. 542 x 6,02 x 1020
e. 542 x 6,02 x 1023
11. Barium chloride, BaCl2 is an ionic compound. If the Avogadro’s number = 6,0 x 1023, the number of cations and anions in 2,08 g BaCl2 (Ar Ba = 137; Ar Cl = 35,5) are ….
a. 1,2 x 1021
b. 6,0 x 1021
c. 1,2 x 1022
d. 1,8 x 1022
e. 1,2 x 1023
12. BaSO4 is an ionic compound. If the Avogadro’s number = 6,0 x 1023, the number of cations and anions in 2,33 g BaCl2 (Ar Ba = 137; Ar S = 32, Ar O = 16) are ….
a. 1,2 x 1021
b. 6,0 x 1021
c. 1,2 x 1022
d. 1,8 x 1022
e. 1,2 x 1023
13. The number of atoms in iron is 1,2 x 1023. The number of mole in iron is ….
a. 0,1
b. 0,2
c. 0,4
d. 0,6
e. 0,8
14. The number of molecules in water is 1,2 x 1022. The mass of water in grams is …. (Ar H = 1; Ar O = 16)
a. 0,1 .
b. 0,2
c. 0,4
d. 0,6
e. 0,8
15. The number of molecules in water is 1,2 x 1022. The number of atoms in water is ….
a. 1,2 x 1022
b. 2,4 x 1022
c. 3,6 x 1022
d. 1,2 x 1023
e. 2,4 x 1023
16. Equal volumes of CO2 gas and a fluorocarbon gas weigh 1.00 and 3.41 grams under the same experimental conditions. Which of the following is the unknown gas? (Ar: C = 12.01, F = 19.00).
a. C3F4
b. C2F6
c. C3F6
d. C2F4
e. CF4
17. Nitric acid, HNO3 is a colorless, corrosive liquid used in the manufacture of nitrogen fertilizers and explosives. In an experiment, a 6,30 g sample of nitric acid was poured into a beaker. The number of mole of HNO3 (Mr = 63) in the sample of nitric acid are ….
a. 0,01
b. 0,05
c. 0,10
d. 1,00
e. 10,0