Please help me with this

(a) calculate the molarity of a solution that contains 0.0345 mol nh4cl in 400 ml of solution. (b) how many moles of hno3 are present in 35.0 ml of a 2.20 m solution of nitric acid? (c) how many milliliters of 1.50 m koh solution are needed to supply 0.125 mil of koh ?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten minutes?