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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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.

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Molar Mass Concept

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.

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Avogadro's Law

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.

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