Ineed with number 9: h, i, k and l

(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 ?

Weak battery is considered to be a part of routine a. inspection b. wear and tear c. maintenance d. check

Find the midpoint m of z1=(8+5i) and z2=(12+3i)