Calculate the mass percent composition of carbon in each carbon-containing compound. c. C₂H₂

Verified step by step guidance

1. Identify the molecular formula of the compound: \( \text{C}_2\text{H}_2 \).
2. Calculate the molar mass of the compound by adding the atomic masses of all atoms in the formula. Use the periodic table to find the atomic masses: Carbon (C) is approximately 12.01 g/mol and Hydrogen (H) is approximately 1.01 g/mol.
3. Calculate the total mass of carbon in the compound by multiplying the number of carbon atoms by the atomic mass of carbon: \( 2 \times 12.01 \text{ g/mol} \).
4. Calculate the mass percent composition of carbon by dividing the total mass of carbon by the molar mass of the compound and then multiplying by 100 to convert it to a percentage.
5. Express the mass percent composition of carbon in the compound as a percentage.

Key Concepts

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all the atoms in a chemical formula. For example, in C2H2, the molar mass is determined by adding the masses of 2 carbon atoms and 2 hydrogen atoms, which is essential for calculating mass percent composition.

Mass Percent Composition

Mass percent composition refers to the percentage by mass of each element in a compound. It is calculated using the formula: (mass of element in 1 mole of compound / molar mass of compound) × 100%. This concept is crucial for understanding the distribution of elements within a compound, such as determining the proportion of carbon in C2H2.

Chemical Formula

A chemical formula represents the types and numbers of atoms in a molecule. For C2H2, the formula indicates that there are 2 carbon atoms and 2 hydrogen atoms. Understanding chemical formulas is fundamental for performing calculations related to molar mass and mass percent composition, as they provide the necessary information about the composition of the compound.