1. Determine the molarity of Fe+3 ions and SO4-2 ions is a solution prepared by

Question

1. Determine the molarity of Fe+3 ions and SO4-2 ions is a solution prepared by dissolving 48.05 g of Fe(SO4)3 in enough water to make 800.0mL of solution.

2. A solution of ethanol(C2H5OH) in water is prepared by dissolving 10.0mL ethanol(density is 0.79g/cc) in enough water to make 250.0mL of solution. What is the molarity of the ethanol solution?

3. 2CH4(g) + 2NH3(g) + 3O2(g) = 6H2O(g) + 2 HCN(g)

How many grams of HCN can be produced if 600.0 g of oxygen is added to mixture of 400. g of ammonia and 300.0 g of methane?

Explanation / Answer

1. You want a 0.500-Molar solution (0.500 mol NaCl / L solution).
You want 175 mL of that solution.
Thus, how many mols of NaCl do you need?

0.500 (mol NaCl / L soln) * 175 mL soln * (1 L soln / 1000 mL soln)
= 0.0875 mol NaCl

What mass of NaCl equals 0.0875 mol NaCl? Get the molar mass from the periodic table of elements (Na = 23.0 g/mol, Cl = 35.45 g/mol)
Thus, the molar mass of NaCl is 23.0 + 35.5 = 58.5 g NaCl / mol NaCl

Now solve:
0.0875 mol NaCl * (58.5 g NaCl / mol NaCl) = 5.11 mol NaCl

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