How many grams are in a mole of each of the following substances? (d) H2O

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Determine the molar mass of each element in the compound H_2O.

Hydrogen (H) has a molar mass of approximately 1.01 g/mol. Since there are 2 hydrogen atoms in H_2O, multiply the molar mass of hydrogen by 2.

Oxygen (O) has a molar mass of approximately 16.00 g/mol. Since there is 1 oxygen atom in H_2O, use the molar mass of oxygen as is.

Add the total mass of hydrogen and the mass of oxygen to find the molar mass of H_2O.

The result is the number of grams in one mole of H_2O.

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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 molecule. For example, in water (H2O), the molar mass is derived from two hydrogen atoms and one oxygen atom, which are approximately 1 g/mol and 16 g/mol, respectively.

Avogadro's Number

Avogadro's number, approximately 6.022 x 10^23, is the number of particles (atoms, molecules, or ions) in one mole of a substance. This constant allows chemists to convert between the number of moles and the number of individual particles, facilitating calculations in stoichiometry and chemical reactions.

Stoichiometry

Stoichiometry is the branch of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. It involves using the molar mass and Avogadro's number to calculate the amounts of substances involved, enabling the determination of how many grams are present in a given number of moles.