What is a chemical formula?
Chemical Formula and Gram-Mole Review

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Chemistry
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10th - 11th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
Back
A chemical formula is a symbolic representation of the composition of a chemical compound, indicating the types and numbers of atoms present.
2.
FLASHCARD QUESTION
Front
What does the subscript in a chemical formula indicate?
Back
The subscript in a chemical formula indicates the number of atoms of the element in one molecule of the compound.
3.
FLASHCARD QUESTION
Front
What is the molar mass of a substance?
Back
The molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).
4.
FLASHCARD QUESTION
Front
How do you calculate the molar mass of a compound?
Back
To calculate the molar mass, sum the atomic masses of all atoms in the chemical formula, multiplied by their respective subscripts.
5.
FLASHCARD QUESTION
Front
What is the chemical formula for potassium sulfide?
Back
The chemical formula for potassium sulfide is K2S.
6.
FLASHCARD QUESTION
Front
What does the formula Mg(NO3)2 represent in terms of its components?
Back
The formula Mg(NO3)2 represents 1 magnesium (Mg), 2 nitrogen (N), and 6 oxygen (O) atoms.
7.
FLASHCARD QUESTION
Front
How many moles are in 27.8 grams of CaCl2?
Back
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.
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