객관식
What is the approximate mass percent of nitrogen and oxygen in nitrogen dioxide (NO_2)?
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3. Chemical Reactions
Mass Percent
객관식
What is the mass percentage of carbon (C) in C2H2 (acetylene)? Provide your answer to two decimal places.
A
85.63%
B
50.00%
C
80.00%
D
92.26%
검증된 단계별 안내1
Identify the molecular formula of acetylene, which is C\_2H\_2, meaning it contains 2 carbon atoms and 2 hydrogen atoms.
Calculate the molar mass of each element: carbon (C) has an atomic mass of approximately 12.01 g/mol, and hydrogen (H) has an atomic mass of approximately 1.008 g/mol.
Calculate the total molar mass of acetylene by summing the contributions of all atoms: total molar mass = (2 \(\times\) 12.01) + (2 \(\times\) 1.008).
Calculate the total mass of carbon in the molecule: mass of carbon = 2 \(\times\) 12.01.
Find the mass percentage of carbon by dividing the total mass of carbon by the total molar mass of acetylene and multiplying by 100%: \%C = \(\left\)( \(\frac{2 \times 12.01}{(2 \times 12.01) + (2 \times 1.008)}\) \(\right\)) \(\times\) 100\%.
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