Chemical Formula and Gram-Mole Review

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What is a chemical formula?

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A chemical formula is a symbolic representation of the composition of a chemical compound, indicating the types and numbers of atoms present.

Front

What does the subscript in a chemical formula indicate?

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The subscript in a chemical formula indicates the number of atoms of the element in one molecule of the compound.

Front

What is the molar mass of a substance?

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The molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

How do you calculate the molar mass of a compound?

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To calculate the molar mass, sum the atomic masses of all atoms in the chemical formula, multiplied by their respective subscripts.

Front

What is the chemical formula for potassium sulfide?

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The chemical formula for potassium sulfide is K₂S.

Front

What does the formula Mg(NO₃)₂ represent in terms of its components?

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The formula Mg(NO₃)₂ represents 1 magnesium (Mg), 2 nitrogen (N), and 6 oxygen (O) atoms.

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How many moles are in 27.8 grams of CaCl₂?

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To find the number of moles, divide the mass (27.8 g) by the molar mass of CaCl₂ (110.98 g/mol), which equals approximately 0.25 moles.

Front

What is the formula for sulfur pentafluoride?

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The formula for sulfur pentafluoride is SF₅.

Front

How do you determine the number of atoms in a compound from its formula?

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Count the total number of atoms by adding the subscripts for each element in the chemical formula.

Front

What is the significance of parentheses in chemical formulas?

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Parentheses in chemical formulas indicate that the enclosed group of atoms is a polyatomic ion or a group that acts as a single unit.