Mr. petrus buys 3 1/4 pounds of grapes for $4.55 what is the unit cost of the grapes

(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 ?

If 20% of a number is 35, what is 50% of that number?

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?