Help with moles please?

0 ⤊

Help with moles please?

Calculate the mass of carbon that would be needed to reduce 15.9g of copper(II) oxide to copper by the reaction:
CuO+C ---> Cu+CO

thank you in advance.

2007-10-17 05:30:06 · 2 answers · asked by Roller 2 in Science & Mathematics ➔ Chemistry

2 answers

Atomic weights: Cu=63.5 O=16 C=12 CuO=79.5

15.9gCuO x 1molCuO/79.5gCuO x 1molC/1molCuO x 12gC/1molC = 2.4g C

2007-10-17 05:39:17 · answer #1 · answered by steve_geo1 7 · 0⤊ 0⤋

NB The molar ratios of the reaction are 1:1::1:1

Moles (CuO) = 15.9/ 80 (Mr CuO)
Moles (CuO) = 0.19875

Because the molar ratios are all '1'

Mole (C) = 0.19875
Mass(C) = 0.19875 x 12 = 2.385 g

2007-10-17 12:40:04 · answer #2 · answered by lenpol7 7 · 0⤊ 0⤋