Can someone please explain how to do these problems and give answers.?

Which problems?

I'm not doing your homework for you. Stay off your iPhone in class, and pay attention.

4) Calculate the amount (in moles) of NaOH required for the neutralization of 19.6 grams of sulfuric acid.

____ NaOH + ____ H2SO4 →____ H2O + ____ Na2SO4

5) Calculate the volume (in milli-liters) of 18.23 M HCl (aq) solution required to prepare 250 mL of 3.645 M HCl solution.

6) Calculate the mass of (in gram) of sulphuric acid (H2SO4) that can be prepared from 4.00 g of sulphur trioxide and excess water.

_____ SO3 + _____ H2O →_____ H2SO4

7) Calculate the amount (in moles) of aluminum produced by the reaction of 2.0 moles of the Al(NO3)3.

_____ Zn (s) + _____ Al(NO3)3 (aq) →_____ Al (s) + _____ Zn(NO3)2 (aq)

8) Calculate the molar concentration (molarity) of HNO3 (aq) prepared by dissolving 47.25 g of HNO3 in enough water to make 250.0 mL of solution.