chemistry help!

Question

How many grams H3FSi does it contain?

How many H3FSi molecules does it contain?

Answer 1

You left out the rest of the question that you posed earlier.

PV = nRT

Solving for n (moles) of H3FSi we have...

n = PV/RT = (75 atm)(0.583 L) / (0.0821 Latm/Kmol)(295K) = 1.81 moles

If you want to know grams, just use the molar mass of H3FSi which is 50.1 g/mol

1.81 moles x 50.1 g/mol = 90.7 g

If you want the number of molecules, use Avogadro's number, 6.02x10²³ molecules/mole...

1.81 moles x 6.02x10²³ molecules/mole = 1.09x10²⁴ molecules