Answer to Question #201305 in General Chemistry for ARCHIE MEDINA

Question

B. Calculate the mass in grams of each of the following samples.

a.1.50x10¹⁸ atoms Ne

b.8.35x10^{21 mole3cules CH}₄

1. What is the percent composition of the following compounds?

a.Naphtalene(C₁₀ H₈)

b Sucrose (C¹² H²² O¹¹)

c Aluminom sulfate (Al₂SO₄)₃

Answer 1

B) a. 1.59 × 10¹⁸/ 6.023 × 10²³

0.00000264 × 20.1797

= 0.0000533g

b). 8.35 × 10²¹/6.023 × 10²³

= 0.0139g

1.a) Molar Mass of Naphthalene = 128.071

C = 12.0107 × 10 = 120.107

= 120.107/128.071× 100 = 93.78%

H = 8.0635/128.071 × 100 = 6.3%