Given the unbalanced combustion equation: C3H8 + O2 → CO2 + H2O, how many moles of carbon dioxide are produced when 64.0 g of oxygen is reacted with excess propane?

Nitric oxide (no) can be formed from nitrogen, hydrogen and oxygen in two steps. in the first step, nitrogen and hydrogen react to form ammonia: n2(g) + 2 h_2(g) rightarrow 2 nh_3 (g) delta h = -92. kj in the second step, ammonia and oxygen react to form nitric oxide and water: 4 nh_3(g) + 5 o_2(g) rightarrow 4no(g) + 6 h_2o(g) delta h = -905. kj calculate the net change in enthalpy for the formation of one mole of nitric oxide from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.