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Sagot :
1) Convert molecules of water into moles of water.
[tex]\text{molesofH}_2O=4.214\cdot10^{22}moleculesofH_2O\cdot\frac{1molofH_2O}{6.022\cdot10^{23}moleculesofH_2O}=0.0700molofH_2O[/tex]2) Use the moles of water in step 1 to find out the number of moles of Epsom salt
[tex]\text{molesofEpsomsalt}=0.0700molofH_2O\cdot\frac{1\text{molofEpsom salt}}{7molesofH_2O}=0.01\text{molof Epsom salt.}[/tex]3) Find the molecular mass of one mol of Epsom salt.
Mg: 24.30 g/mol
S: 32.065 g/mol
O: 15.999 g/mol
H: 1.008 g/mol
The molecular mass of Epsom salt (MgSO4 * 7H2O) is
(24.30*1)+(32.065*1)+(15.999*4)+(1.008*14) +(15.999*7) =826.3571 g/mol
4) Convert moles of Epsom salt into grams of Epsom salt.
[tex]\text{gramsofEpsomsalt}=0.01\text{molofEpsomsalt}\cdot\frac{826.3571\text{ g of Epsom salt}}{1\text{molofEpsom salt}}=8.263\text{ g of Epsom salt.}[/tex]
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