Question

calculate the number of moles in 50.7 grams of hydrogen

Answer 1

NO. OF MOLES = GIVEN MASS/ MOLECULAR MASS
= 50.7/1
= 50.7 MOLES


AND MOLECULAR MASS OF HYDROGEN IS 1.

Answer 2

Answer:

305.36*10^23

Explanation:

First of all,find out the number of moles of H2 molecules in 50.7g.

 As 2gmol^-1 is the molar mass of  H2..............divide 50.7g by 2gmol^-1.then U get the no. Of moles of H2 in 50.7g Of H2.That is 25.35 moles.

So....as there are 2 H atoms in a H2 molecule,there are also 2 moles of H atoms in a 1 mole of H2 molecules.

1 mole= 6.023*10^23 atoms

(as dozen = 12)

then to find out the total no.of H atoms multiply 25.35 mol by 6.023*10^23 and again by 2(25.35 * 6.023*10^23 * 2).then U get the #. Of H atoms in 50.7g of H2 molecules!!!!!!! 305.36*10^23!!!!

answer was from yahoo.com