Question

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MULTIPLE CHOICE QUESTION
To combine sodium and oxygen, how many oxygen is needed and how many
sodiums are needed?
1; 1
1; 2
2; 1

Answer 1

We need the chemical equation first

$\\ \tt\bull\rightarrowtail {Na\atop Sodium}+{O_2\atop Oxygen}\longrightarrow {Na_2O\atop Sodium\: oxide}$

• Na=1
• O=2

The ratio is 1:2