chemistry

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A 0.821 sample of a substance composed of diatomic molecules has a mass of 131.3g. Identify this molecule.

May I have your expert help with this question? Thank you.

  • chemistry -

    .821 what?

  • chemistry -

    I'm sorry...it's a 0.821-mol sample of a substance.....

    Thank you

  • chemistry -

    Please help me with this question.

    Give the formula for calcium phosphate and then answer the following questions:

    (a)Calculate the percent composition of each of the elements in this compound.
    (b)If you knew that there was 50.0g of phosphorus in your sample,how many grams of calcium phosphate would you have? How many moles of calcium phosphate would this be? How many formula units of calcium phosphate?

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