I dont know how to do this one either someone plaese help me...

(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 ?

You can find the constant of proportionality by finding the ratio of

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9