Could anyone help me? this is hard i dont understand

(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 ?

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?

Qrst is a parallelogram. determine the measure of ∠q pls