Quantitative chemistry

1

What are the units for concentration?

2

What is the concentration of 0.5 moles of HCl dissolved in 250cm3 of solution?

3

Using the equation, calculate the atom economy of reduction of iron(III) oxide using carbon, where iron is the desired product.

2Fe2O3 + 3C -> 4Fe + 3CO2

4

What is the empirical formula of octane C8H18?

5

Which of the following statements about hydrated salts is false?