Question

a sample of phosphorous has 0.5 moles of P4 molecules
1]how many P4 molecules are there?
2]how many P atoms are there?
3]how many moles of P atoms are there in the sample?
4]what is the mass of the sample?

Answer 1

Note the correct spelling of phosphorus.

a.
A mole contains 6.02E23 molecules; therefore, there are 0.5 x 6.02E23 = ?

b.
Since there are 4 P atoms to 1 P4 molecules, there must be 4 x the number in a.

c.
You have 0.5 mole P4 molecules; there must be 4*0.5 = ? mols P atoms.

d.
grams = mols x molar mass = ?

Answer 2

Answer