What is the mass in grams of each elemental sample?

(a) 6.64 mol W

(b) 0.581 mol Ba

(c) 68.1 mol Xe

(d) 1.57 mol S

Solution 30P

There are three steps to converting moles of a substance to grams:

- Determine how many moles are given in the problem.
- Calculate the molar mass of the substance.
- Multiply step one by step two.

(a) 6.64 mol W = The molar mass of W is 183.84 g/mol.

Thus the mass in gram is = 6.64 mol x (183.84 g/mol) = 1220 g W

(b) 0.581 mol Ba = The molar mass of Ba is 137.32 g/mol

Thus the mass in gram is = 0.581mol x (137.32 g/mol) = 79.782 g W

(c) 68.1 mol Xe = The molar mass of Xe is 131.29 g/mol

(The number of mol of Xe(68.1) given in the question seems wrong, The problem has been solved as per given data)

Thus the mass in gram is = 68.1 mol x (131.29 g/mol) = 8,940.849 g W

(d) 1.57 mol S =The molar mass of S is 32.065 g/mol

Thus the mass in gram is = 1.57 mol x (32.065 g/mol) = 50.34 g W