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What is the percent by mass of carbon in C10 H14 N2?
total mass of element in compound
Use % Element =
molar mass of compound
10 x 100
8.71%
17.27%
69.50%
74.02%

Respuesta :

cristisp93

74.02 % of carbon in the C₁₀H₁₄N₂ compound.

Explanation:

First we need to calculate the molar mass of the compound:

molar mass of C₁₀H₁₄N₂ = atomic weight of C × 10 + atomic weight of H × 14 + atomic weight of N × 2

molar mass of C₁₀H₁₄N₂ = 12 × 10 + 1 × 14 + 14 × 2 = 162 g/mole

Now we devise the following reasoning:

if        162 g of C₁₀H₁₄N₂ contains 120 g of carbon

then  100 g of C₁₀H₁₄N₂ contains X g of carbon

X = (100 × 120) / 162 = 74.07 % which is close to 74.02 %

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Answer:

d

Explanation:

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