How many grams of a 23.4% by mass NaF solution is needed if you want to have 55.9 g of NaF?

Using the electronegativity difference, what type of bond is expected for a compound formed between calcium and bromine?

A solution has a hydrogen ion concentration of 1×10−81 \times 10^{-8} M. What is the pH and is the solution acidic or basic?

What is the total pressure of a container that contains 12.5 atm oxygen gas, 14.5 atm nitrogen gas and 18.5 atm argon gas? 

If the molarity on an NaOH solution is 3.50 M and you have a volume of 225 mL, calculate the grams of the solute.

An 8.5 L tire is filled with 0.55 mol of gas at a temperature of 305 K. What is the pressure (in atm) of the gas in the tire?

Given the chemical equation: 2 Ca(s) + O2(g) -> 2 CaO(s) If 2 moles of CaO are formed in this reaction, then 2 moles of O2 must have reacted.

How many moles of solid aluminum are needed to make 9 moles of hydrogen gas? Given the reaction: 2Al(s) + 6HCl(aq) -> 2AlCl3(s) + 3H2(g)

The Arrhenius definition of a base is:

How many grams of chlorine gas are needed to make 117 grams of solid sodium chloride? Given the reaction: 2Na(s) + Cl2(g) -> 2NaCl(s)