Essential Chemistry for IGCSE - Chemical Calculations (Section 6 - No. 49)
If you have 117 grams of sodium chloride (NaCl), how many moles do you have? (Na=23, Cl=35.5)
0.5 moles
1.0 moles
1.5 moles
2.0 moles
Explanation
Molar mass = 23 + 35.5 = 58.5 g/mol. Moles = 117g/58.5 g/mol = 2 moles
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