How many hydrogen and oxygen atoms are in a water molecule H2O

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

What term describes technology that operates on an atomic level

Consider the reaction: 2al(s) + fe2o3(s) → al2o3(s) + 2fe(s) the δhf for fe2o3(s) = -824.3 kj/mole. the δhf for al2o3(s) = -1675.7 kj/mole. finish the equation. δhrxn = [(1)( kj/mole) + (2)( kj/mole)] - [(1)( kj/mole) + (2) ( kj/mole)]