Magnesium oxide (MgO) forms when magnesium metal burns in air. (a) If 1.25 g of MgO contains 0.754 g of Mg, what is the mass percent of Mg in MgO? (b) What is the mass percent of O in MgO? c) How many micrograms of oxygen are in 534 kg of MgO?

Identifying limitations of kinetic-molecular theorya chemist is studying the properties of a gas under various conditions. he observes that when the gas is at room temperature and low pressure, it behaves as an ideal gas. when the gas is cooled to 10 kelvin and is placed under high pressure, however, it deviates significantly from an ideal .

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million