EMPERICAL FORMULA

What is the emperical formula of a compound containing 83% potassium and 17.0% oxygen?

coefficients

What are the coefficients for the following reaction when it is properly balanced: O2 +CH4 > CO2 + H20

I don't know what the steps are to solve this problem, can someone explain the steps to me?

How many grams of aluminum chloride are produced when 18 grams of aluminum are reacted with an access of hydrochloric acid?

Calculating molarity in an acid/base titration

If 25.00 mL of 1.000M HNO^3 is titrated to a neutral endpoint with 36.97 mL of NaOH solution, what is the molarity of the NaOH solution?

Calculating molarity in an acid/base titration

If 10.00 mL of 0.2500M Mg(OH)2 is titrated to a neutral endpoint with 13.43 mL H2SO4, what is the molarity of the H2SO4?

Calculating molarity

Calculate the molarity of 30.1 mL HCl in a solution of 13.0 mL of NaOH.

Percent by mass

On january 1st of 2003 there were 50 kg of cucumbers in a vegetable store and they were 99% water by mass. On february 1st of 2003 they were 98% water, by mass due to loss of water through vaporization. What was the mass of cucumbers on February 1st of 2003?

Reactions

How many moles of water are made from the reaction of 2.2 moles of oxygen gas with unlimited quantities of hydrogen gas? Given the reaction:2H2 + O2 > 2H2O

REACTIONS

How many grams of water are made from the reaction of 4.0 grams of hydrogen gas? Given the reaction:2H2 + O2 > 2H2O

Limiting reagants

What is the limiting reagant for the following reaction given 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4 Reaction:3Ca(NO3)2 + 2LI3PO4 > 6LiNO3 +Ca3(PO4)2