The Student Room Group

Calculating mass

Hydrochloric acid and copper oxide react to form copper chloride and water.
The balanced symbol equation is shown below.

2

H
C
l
+
C
u
O

C
u
C
l
2
+
H
2
O
2HCl+CuO

CuClX
2


+HX
2


O

0.5 moles of hydrochloric acid reacted with an excess of copper oxide.

Calculate the maximum mass of copper chloride that can be produced.
Looking at the equation

CuO + 2HCl —> CuCl2 + H2O

For every 2 moles of HCl that react, 1 mole of CuCl2 is made.

As such, can you use this ratio to determine how many moles of CuCl2 will form when 0.50 moles of HCl completely react?

The relative atomic masses of Cu and Cl are 63.5 and 35.5, respectively. So what is the relative mass of CuCl2?

Multiply the moles of CuCl2 by its relative mass and you have your answer.

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