Question

Determine the number of moles P4(s) in a 2.0 gram sample.

Answer 1

0.016 moles

Explanation: Because you are doing P4, you take the molar mass/atomic mass of phosphorous which is 30,97(rounded up) and multiply it by 4 since that's the subscript. Then you take 2.0 grams and divide it by the molar mass, which is 123.88, and that gives you 0.016 moles (rounded up)