Norm

What is the concentration (in M) of H+ present in the solution formed by mixing 20 mL of 0.100 M HCl and 10.0 mL of 0.500 M HCl

I buy 20 gallons of gas, 15 premium and 5 regular. Regular gas is 20 cents cheaper per gallon. I spend $42 total; what is the price of each type of gas?

Johnny has 30 marbles. Mark has m marbles, if Johnny has 10 times as many as mark, write an equation that shows how many marbles mark has.

Consider these reactions, where M represents a generic metal. 2M (s)+ 6HCl(aq)⟶2MCl3 (aq)+3H2 (g) ΔH1= -831.0 kJ HCl (g) ⟶ HCl (aq) ΔH2= −74.8 kJ H2 (g) + Cl2 (g) ⟶ 2HCl (g) ΔH3= −1845.0 kJ MCl3 (s) ⟶ MCl3 (aq) ΔH4= −461.0 kJ Use the given information to...