Multiple Choice
What is the percent by mass of sodium chloride in a 1.40 M NaCl solution with a density of 1.07 g/mL?
3. Chemical Reactions
Mass Percent
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What is the mass percent composition of carbon in carbon dioxide (CO2)?
A
44.0%
B
72.7%
C
27.3%
D
100%
Verified step by step guidance1
Identify the chemical formula of carbon dioxide, which is CO2.
Determine the molar mass of carbon dioxide by adding the molar masses of its constituent elements: carbon (C) and oxygen (O). The molar mass of carbon is approximately 12.01 g/mol, and the molar mass of oxygen is approximately 16.00 g/mol.
Calculate the total molar mass of CO2 using the formula: Molar mass of CO2 = (1 × Molar mass of C) + (2 × Molar mass of O).
Calculate the mass percent composition of carbon in CO2 using the formula: Mass percent of C = (Molar mass of C / Molar mass of CO2) × 100%.
Substitute the values obtained in the previous steps into the formula to find the mass percent composition of carbon in carbon dioxide.
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