Could someone help with as many of these as they can? 1.how many moles of h20 are needed to make 0.82 moles of NaOH
2. if a reaction used 22.6g of Na2O how many moles of H2O are needed to react with it
3. how many grand of NaOH would be formed by placing 3.64g of Na2O in excess water​

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Acompound contains c, h, and o atoms. when 1.130 g of the compound is burned in oxygen, 1.064 g co2 and 0.3631 g h2o are produced. what is the empirical formula of this compound?

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils