If 20.0 kg CO2 are produced from the combustion of butane (C4H10), what is the mass of oxygen gas that was consumed

Acylinder is filled with 2.00 moles of nitrogen, 3.00 moles of argon and 5.00 moles of helium. if the gas mixture is at stp, what is the partial pressure of the argon

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?