Question

How many moles of MgO are produced when .250 mol of Mg reacts completely with O2

Answer 1

0.250 moles of MgO are produced when 0.250 mol of Mg reacts completely with O₂

Step-by-step explanation:

In first place, the balanced reaction between Mg and O₂ is:

2 Mg + O₂ ⇒ 2 MgO

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reactants and products participate in the reaction:

• Mg: 2 moles
• O₂: 1 mole
• MgO: 2 moles

Then you can apply the following rule of three: if by reaction stoichiometry 2 moles of Mg produce 2 moles of MgO, 0.250 moles of Mg, how many moles of MgO will they form?

`moles of MgO=(0.250 moles of Mg*2 moles of MgO)/(2 moles of Mg)`

moles of MgO= 0.250

0.250 moles of MgO are produced when 0.250 mol of Mg reacts completely with O₂