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Problem
What is the approximate molar mass, in
g mol
−
1
\text{g mol}^{-1}
g mol
−
1
, of
MgSO
4
⋅
7
H
2
O
\text{MgSO}_4 \cdot 7\text{H}_2\text{O}
MgSO
4
⋅
7
H
2
O
? a. 120 b. 130 c. 138 d. 246
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