A student investigated the reaction of magnesium with oxygen. The student calculated that 4.8 g of magnesium would make 8.0 g of magnesium oxide.

The equation for the reaction is:

2Mg + O2 → 2MgO

What mass of oxygen is required to produce 8.0 g of magnesium oxide from 4.8 g of magnesium?

Based on The Law of Conservation of Mass Lavoisier, the mass of oxygen required is 3,2 g

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.