X is an impure sample of a Group 2 metal carbonate, MCO$_3$. X contains 57% by mass of MCO$_3$. The impurities in X do not react with hydrochloric acid.
7.4 g of X is reacted with an excess of dilute hydrochloric acid.
0.050 mol of the Group 2 metal chloride is produced.
What is the identity of the Group 2 metal?
Mg
2 )
Ca
3 )
Sr
4 )
Ba
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