Find the concentration (M) of a solution prepared when 2.50 mol NaCl are dissolved in
enough water to make 20.0 L solution.

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?

Ab c or d ? i’m not sure what the answer is

Suppose you mix one mole of sulfuric acid (h2so4) with 1 mole of sodium hydroxide(naoh). why does the ph of the solution remain below 7? ( explain so i can get better understanding! )