What is the density of a solid?

Question

41. Mass of solid 18.325
Volume of water in cylinder 10.00 cm^3
Volume of water + solid 16.80 cm^3
What is the density of the solid?
a)0.372g/cm^3
b) 1.09 g/cm^3
c) 1.83 g/cm^3
d) 2.69 g/cm^3

42. A gold brick is 0.958 cm high, 2.020 cm wide, and 4.o cm long. What is its volume?
a) 7.7 cm^3
b) 7.74 cm^3
c) 7.74064 cm^3
d) 8 cm^3

45. What quantity of silver ions is obtained from 3.00 g of AgNO3?
a) 0.0177 mol
b) 0.0385 mol
c) 26.0 mol
d) 56.6 mol

46. What is the volume of 2,50 mol of varbon dioxide at STP?
a) 22.4 L
b) 44.8 L
c) 56.0 L
d) 110.L

47. Which quantity of carbon is contained in 0.15 mol of benzene, C6H6?
a) 0.15 mol
b) 0.90 mol
c) 12 mol
d) 18 mol

Answer 1

41. 18.325 g/ 6.80 ml = 2.69 g/ml. D
42. V = 0.958 * 2.020 * 4.0 = 7.7 cm^3. 2 significant figures.
45. 3.00 g AgNO3 / 169.87 g/mole = 0.0177 moles. One ion of silver per molecule.
46. 2.5 mol * 22.4 L/mol = 56 L
47. 0.90 mol. Six carbons per molecule, or six moles of carbon per mole of benzene.

Answer 2

41.)
16.80 - 10 = 6.80
18.325g / 6.80 mL = 2.69 D

42.).958 * 2.02 * 4 = 7.74 B

45.) 3g / 137.8742 g/mol = .0177 moles A

46.)At STP 1 mol = 22.4 L so 2.50 * 22.4 = 56 L C

47.).15 mol * 6 mol C = .9 mol B