Question 7.CC.8: How many grams of O2 are needed to completely react with 14.......
How many grams of O_2 are needed to completely react with 14.6 g of Na?
4 Na (s)+ O _2(g) \longrightarrow 2 Na _2 O (s)Step-by-Step
\underset{\text{Three SFs}}{14.6 \cancel{g Na}}\times\underset{\text{Four SFs}}{\overset{\text{Exact}}{\frac{1\ \cancel{ mole\ Na}}{22.99\ \cancel{g\ Na}}}}\times\underset{\text{Exact}}{\overset{\text{Exact}}{\frac{1\ \cancel{mole\ O_2}}{4\ \cancel{moles\ Na}}}}\times\underset{\text{Exact}}{\overset{\text{Four SFs}}{\frac{32.00\ g\ O_2}{1\ \cancel{mole\ O_2}}}}=\underset{\text{Three SFs}}{5.08\ g\ \text{of }O_2}
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