Question

Calculate the number of moles in 25.0 g of each of the

Answer 1

Answer:

A. 6.25moles

B. 0.78moles

C. 0.32moles

D. 0.15moles

E. 0.43moles

Explanation:

use

• n = mass/molar mass

A. He

• 25/4 = 6.25moles

B. O2

• 25/32 = 0.78moles

C. Al(OH)3

• 27+ 3(17) = 78
• 25/78 = 0.32 moles

D. GaS3

• 70+3(32) = 166
• 25/166 = 0.15moles

E. C4H10

• 4(12)+10(1) =58
• 25/58 = 0.43moles