You need to dissolve CaCl2 in water to make a mixture that is 30.5% calcium chloride by mass. If the total mass of the mixture is 453.4 g, what masses of CaCl2 and water should be used?

Question

anonymous · Answer

This one is simple what you need to do is remember that 30.5% is a ratio its like saying 30.5g of solute(CaCl2)/100ml of solvent(h2o) Its always safe to assume that when they give u percent. and if the problem states its water as solvent because water is special. so what its asking is how much of the mass of the total solution has CaCl2 in it? well u know that theres 30.5g for ever 100mL so (30.5/100)=.305* the mass of the total solution 453.4g and you should get 138g of CaCl2 and 453.4-138=315g of solvent. hope that helps.