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how many moles of MgSO4 are in 2.07g of MgSO4

Chemistry
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The first thing to do is to work out how what the mass of one mole of MgSO4 is...I don't have a periodic table with me so you'll have to look up the exact values but it will be something like (Mg) g/mol + 32 g/mol + 4x16 g/mol = XY g/mol for MgSO4 That's the molar mass. Then you can just divide the mass of the substance by it's molar mass to get number of moles: So: \[\frac{ 2.07g }{ XYg/mol}=N^{o} moles\]
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