How many grams of ZnCl will be formed from a reaction between 6.5g of Zn and 3.2g of Hcl (at. Weight of Zn=65; and Cl=35.5
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Answer:
6.81 grams of ZnCl will be formed
Explanation:
Given
mass of Zn = 6.5 g
mass of HCl = 3.2 g
mass of ZnCl = ??
Solution
Zn + 2HCl -------> ZnCl2 + H2
first convert grams to moles
No. of Moles = Given mass/ Molecular mass
for Zn
No. of Moles = 6.5 / 65
No. of Moles = 0.1 mol
for HCl
No. of Moles = 3.2/ 36.5
No. of Moles = 0.08 mol
from reaction the ratio of ZnCl2 and HCl is 1:2
while ZnCl2 to Zn is 1:1 thus Zn is a limiting reactant
the molar mass of ZnCl2 is 136.27 g/mol
No. of Moles = Given mass/ Molecular mass
0.05 = mass / 136.27
mass = 6.81 g
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