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# answer chemistry homework ?

How many Si atoms are there in a 92.8 gram sample of Si ?

______atoms

How many grams of Co are there in a sample of Co that contains 3.90×10^23 atoms?

______grams

A sample of Sr weighs 56.0 grams. Will a sample of P that contains the same number of atoms weigh more or less than 56.0 grams? (more, less): __________

Calculate the mass of a sample of P that contains the same number of atoms.

______grams of P

### 1 Answer

Relevance
• You'll need some atomic weights:

Si, 28.086; Co, 58.933; Sr, 87.62; P, 30.974.

#1.  (6.022 x 10^23 atoms)*(92.8/28.09) = around 2 x 10^24 but use a calculator.

#2.  (58.933 g)*(3.90/6.022) = around 38 g but use a calculator.

#3.  Less.

#4.  (56.0 g)*(30.974/87.62) = around 20 g but use a calculator.

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