Question

Match the items on the left with those on the right. A 100 g sample that is 40.92% carbon by mass A 100 g sample that is 4.58% hydrogen by mass A 100 g sample that is 54.50% hydrogen by mass 200 g sample that is 40.92% carbon

A. has 40.92 g C

B. has 4.58 g H

C. has 54.50 g H

D. has 81.84 g C

i know you have to set up as the grams you have divide by the mas of the object but im to sure i did it right

Answer 1

1) A 100 g sample that is 40.92% carbon by mass

Mass of Carbon = Mass of sample x (Mass % of Carbon / 100)

=> Mass of Carbon = 100 x (40.92 / 100) = 40.92 g of C

A. has 40.92 g C

2) A 100 g sample that is 4.58% hydrogen by mass

=> Mass of Hydrogen = 100 x (4.58 / 100) = 4.58

B. has 4.58 g H

3) A 100 g sample that is 54.50% hydrogen by mass

=> Mass of Hydrogen = 100 x (54.5 / 100) = 54.5 g

C. has 54.50 g H

4) A 200 g sample that is 40.92% carbon by mass

=> Mass of Carbon = 200 x (40.92 / 100) = 81.84 g

D. has 81.84 g C