# 4.74 gm of CuO when heated with current of H2 gave 3.78 gm of metal.Find the Equivalent mass of Cu?

Jun 4, 2018

The equivalent mass of $\text{Cu}$ is 32 g.

Step 1. Calculate the mass of $\text{O}$ in the $\text{CuO}$

$\text{Mass of O = (4.74 - 3.78) g = 0.96 g}$

Step 2. Calculate the equivalent mass of the copper

The equivalent mass of a substance is the mass that will react with 8 g of oxygen.

$\text{Equivalent mass" = 8 color(red)(cancel(color(black)("g O"))) × ("3.78 g Cu")/(0.96 color(red)(cancel(color(black)("g O")))) = "32 g Cu}$