The amount (g) for pure MgSO4 in the following statement is actually 2. 4 g pure MgSO4•7H2O was 1.2 g MgSO4.
A Quick Look at Quantity. When referring to just a single word that CANNOT be measured, use the word amount. - When referring to a solitary or plural term that CAN be counted, use number. – When referring to an inanimate, singular or plurality word that is counted or measured, quantity should be used.
%MgSO4 in MgSO4.7H2O is determined as x 100 = ?
Molar mass of MgSO4.7H2O is 246.4746 g/mol
Molar mass of MgSO4 is 120.366 g/mol.
In MgSO4.7H2O, %MgSO4 = 120.366 / 246.4746 = 0.488 x 100 = 48.8
2.4g × (%MgSO4/100) = 2.4 x (48.8/100) =
2.4 x 0.48
= 1.2g MgSO4
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