Formula weight method in chemical arithmetic

A chemical equation tells not only what substances, but also how much of these substances, are involved in a chemical reaction. For example, the equation 

If now we want to find the weight of materials necessary to provide 400 grams of NaOH we translate this into F.W. From inspection of the equation we find the number of F.W. of each material and then translate into grams  

How many times normal is each of the following solutions  

(a) What is the normality of a solution of HC1 containing 39 per cent by weight of HC1 and of specific gravity 1.19  

How many cubic centimeters of the concentrated sulphuric acid of 3 (d) should be taken to make 1 liter of normal solution  

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