Question

An organic compound contains 0.031% of phosphorus by mass. If a molecule of the compound

contains a single atom of phosphorus, calculate the molar mass of the compound (given P= 31).

What can you say about the volume of a molecule of the compound
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Answer 1

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This means that If the atomic mass of P is 31, then the molecular mass of the compound having one phosphorus atom per molecule is 3.1×105. Thus, the correct option is A. 3.1×105 .

Determine the mass of the substance, and its molar mass. Divide the given mass by its molar mass to get moles, then multiply times 6.022×1023molecules1mol