Calculate the formula mass for each compound. c. H2SO4

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Identify the elements in the compound H2SO4: hydrogen (H), sulfur (S), and oxygen (O).

Determine the number of each type of atom in the compound: 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms.

Find the atomic mass of each element from the periodic table: hydrogen (H) is approximately 1.01 amu, sulfur (S) is approximately 32.07 amu, and oxygen (O) is approximately 16.00 amu.

Calculate the total mass contributed by each element: multiply the atomic mass of each element by the number of atoms of that element in the compound.

Add the total masses of all elements together to find the formula mass of H2SO4.

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주요 개념

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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 H2SO4, the molar mass is derived from the contributions of hydrogen (H), sulfur (S), and oxygen (O) atoms.

Atomic Mass

Atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu). Each element has a specific atomic mass that can be found on the periodic table. For H2SO4, the atomic masses of hydrogen (approximately 1.01 amu), sulfur (approximately 32.07 amu), and oxygen (approximately 16.00 amu) are used to calculate the total molar mass.

Chemical Formula

A chemical formula represents the composition of a compound, indicating the types and numbers of atoms present. In H2SO4, the formula shows that there are two hydrogen atoms, one sulfur atom, and four oxygen atoms. Understanding the chemical formula is essential for calculating the formula mass, as it directly informs the quantities of each element involved.