How many moles of water (H2O) are present in a beaker containing 45.9 g H2O? Give your answer to the correct number of significant figures.

(Molar mass of water = 18.02 g/mol) 45.9 g H2O = mol H2O

The average atomic mass of chromium is 52.00 amu. What is the mass of 3.0 mol of chromium?

at the top of a mountian the pressure is found to be 0.52 atomspheres how does this compare to standard atmosphere pressure at sea level?

7.00 g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and to have a molar mass of 70. g/mol, is burned completely in excess oxygen, and the mass of the products carefully measured. 21.96 g of carbon dioxide and 8.

Look carefully at Kw expression. If the [H+] changed from [1 x 10-7] to [1 x 10-4], the [OH-] will:

An atom of sodium-23 (atomic number = 11) has a positive charge of + 1. Given this information, how many electrons does it have? How many protons and neutrons does this atom have?

Which of the following is true for all chemical reactions? The total mass of the reactants increases. The total mass of the reactants equals the total mass of the products.

Is the osmotic pressure of a 0.10 M solution of NaCl greater than, less than, or equal to that of a 0.10 M solution of KBr? a. equal tob. greater thanc. less thand. insufficient information

What are the metalloids on the periodic table?

Which of these answers best describe a fossil?

What kind of reaction is S (s) + O₂ (g) →SO₂ (g)