How many millilitree of `6.0` M hydrochloric acid should be used to prepare 150 ml of 0.30 M HCl solution ?

How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO_(3) solution ? The concentration of nitric acid is 70 % by mass.

How many g of NaOH will be needed to prepare 250 mL of 0.1 M solution?

How many gram of concentrated nitric acid solution should be used be prepare 250 mL of 2.0 M NHO_3 ?

How many mL of 8.00 M HCl are needed to prepare 150 mL of a 1.60 M HCl solution?