A laboratory has a 2.0-mol sample of pure selenium and a 2.0-mol sample of pure chromium. How many more grams of selenium than chromium does this represent?

A) 65.5 g

B) 53.9 g

C) 27.0 g

D) 13.5 g

Question

Amanda Gaines

Chemistry

15 May, 15:52

A laboratory has a 2.0-mol sample of pure selenium and a 2.0-mol sample of pure chromium. How many more grams of selenium than chromium does this represent?

A) 65.5 g

B) 53.9 g

C) 27.0 g

D) 13.5 g

+4

Answers (1)

Know the Answer?

Kaelyn Patton · Answer 1

B. 53.9

With my periodic table the math works out to:

2 mol Se * (79.0g Se/1 mol Se) = 158.0g Se

2 mol Cr * (52.0g Cr/1 mol Cr) = 104.0g Cr

158.0g Se - 104.0g Cr = 54.0g

A laboratory has a 2.0-mol sample of pure selenium and a 2.0-mol sample of pure chromium. How many more grams of selenium than chromium does this represent?A) 65.5 gB) 53.9 gC) 27.0 gD) 13.5 g

A laboratory has a 2.0-mol sample of pure selenium and a 2.0-mol sample of pure chromium. How many more grams of selenium than chromium does this represent?

A) 65.5 g

B) 53.9 g

C) 27.0 g

D) 13.5 g