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An aqueous solution of concentrated hydrobromic acid contains 50% HBr by mass. If the density of the...?

If the density of the solution is 1.50g/ml, calculate the concentration of the solution?

and also this question.. i tried it but I just don't get it..

Fe2O3(s)+3CO(g) ---> 2Fe(l) + 3O2(g)

Suppose that exactly 2 mol of iron iron(iii)oxide and 1 mol of carbon monoxide are mixed together and allowed to react in a furnace. After the reaction is complete, there are 0.667 mol of iron metal in the furnace. Is there an iron (iii) oxide or carbon monoxide left over unreacted in the flask after the reaction is complete? If so, which is left over and how much is left?

Help appreciated!

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