Stoichiometry and Balanced Equations

Front

What is Stoichiometry?

Back

Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the balanced equations.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has equal numbers of each type of atom on both sides of the equation, ensuring the law of conservation of mass is followed.

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How do you convert moles to grams?

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To convert moles to grams, multiply the number of moles by the molar mass of the substance (grams/mole).

Front

How do you convert grams to moles?

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To convert grams to moles, divide the mass of the substance (in grams) by its molar mass (grams/mole).

Front

What is the molar mass of water (H2O)?

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The molar mass of water (H2O) is approximately 18.02 g/mole.

Front

What is the mole-to-atom conversion factor?

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1 mole of any substance contains approximately 6.022 x 10^23 atoms (Avogadro's number).

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How many moles of CO are produced from 3 moles of C in the reaction SiO2 + 3C → SiC + 2CO?

Back

2 moles of CO are produced from 3 moles of C.

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If you have 4.57 x 10^13 atoms of copper, how many moles do you have?

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You have approximately 7.59 x 10^-11 moles of copper.

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What is the relationship between coefficients in a balanced equation and moles?

Back

The coefficients in a balanced equation represent the ratio of moles of each substance involved in the reaction.

Front

How many grams of hydrogen are produced from 120 g of sodium in the reaction 2Na + 2H2O → 2NaOH + H2?

Back

5.2 grams of hydrogen are produced.