I need help answering number 4? For the next four questions, consider the follow

Question

I need help answering number 4?

For the next four questions, consider the following equation. 2Mg + O_2 rightarrow 2MgO The number of moles of oxygen gas needed to react with 4.0 moles of Mg is __________. 1.0 mole. 2.0 moles. 3.0 moles. 4.0 moles. 6.0 moles. The number of moles of MgO produced when 0.20 mole of O_2 reacts completely is _________. 0.10 mole. 0.20 mole. 0.40 mole. 0.60 mole. 0.80 mole. How many moles of magnesium are needed to react with 16 g of O_2 0.50 mole 1.0 moles 2.0 moles 3.0 moles 4.0 moles

Explanation / Answer

The number of moles of oxygen requires to react with 4 moles of Mg is

2Mg+O2-->2MgO

2 moles of Mg requires 1 mole of oxygen

4 moles of Mg requires 2 moles of Oxygen

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