Calculate the empirical formula of a compound that has a composition of 5.9% of hydrogen and 94.1% oxygen.

Which of the following element does not have one valance electron?

The equation N2 + 3H2 —– 2NH3 can be interpreted as follows: 1 mol of N2 reacts with 3 mol of H2 to form 2 mol of NH3. Is this statement true or false?

When you balance the following reaction, what’s the sum of all the coefficients?   C5H12 + O2——CO2 + H2O 

Which substance is the solute and which is the solvent in each of the following solutions?   a) Seltzer water (also known as club soda or soda water)

Select the balanced equation for the combustion of ethylene, C2H4 shown below.

What’s the molecular formula of a compound that contains 40%C, 6.66%H and 53.3% O. (Molar mass of this compound is 150 g)

Which one of the following substances is the product of this reaction? And the coefficient of the product in the balanced reaction?   Magnesium + Nitrogen gas →  

How would you write 0.000725 in scientific notation?

A value of 25.0 mL is a measurement of ____________________