3.2 moles of the element weigh 78 grams. What is this substance?
| August 2, 2021 | education
To solve the problem, you need to add the proportion. So 78 grams of an element will have 3.2 moles, and 1 mole of an element will contain X grams. Hence the proportion: 78 grams – 3.2 mol, X gram – 1 mol. X = 78 * 1 / 3.2 = 24.37 grams. The element magnesium (Mg) has a molar mass of 24.3.
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