Do I do this like somebody please help me because I am struggling

(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 ?

Use the graph of the sine function y=2sinθ shown below

During a wright loss challenge your friend goes from 125 pounds to 100 pounds. what was the percent weight loss