兩題chemistry的molarity問題

兩題chemistry的molarity問題
麻煩show steps.

1)
You are given 25.0 cm^3 of 18.0M hydrochloric acid. Calculate the molarities if the following volumes of water are added successively: 25.0cm^3, 75.0cm^3, 100cm^3.

2)
A commercial ammonia called "0.68 ammonia' has a density of 0.68 g cm^-3 and contains approximately 34% of ammonia by mass.
a). Calculate the mass of ammonia present in 1 dm^3 of the solution of this commercial ammonia.
b). Calculate the molarity of this solution.
c). Calculate the volume of distilled water added if the solution has to be diluted to 1 mol dm^ -3.

萬分感謝