
Mole Calculations; % Comp; MF/EF FLASHCARD
Flashcard
•
Chemistry
•
9th - 12th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
How many molecules are in 1 mole of a substance?
Back
6.022 x 10^23 molecules (Avogadro's number)
2.
FLASHCARD QUESTION
Front
What is the formula to calculate the mass of a substance in grams from moles?
Back
Mass (g) = Moles x Molar Mass (g/mol)
3.
FLASHCARD QUESTION
Front
Define Molar Mass.
Back
The mass of one mole of a substance, usually expressed in grams per mole (g/mol).
4.
FLASHCARD QUESTION
Front
What is the difference between empirical formula and molecular formula?
Back
Empirical formula shows the simplest whole-number ratio of atoms, while molecular formula shows the actual number of atoms in a molecule.
5.
FLASHCARD QUESTION
Front
How do you calculate the percent composition of an element in a compound?
Back
Percent Composition = (Mass of element in 1 mole of compound / Molar Mass of compound) x 100%.
6.
FLASHCARD QUESTION
Front
What is the molar mass of water (H2O)?
Back
18.02 g/mol.
7.
FLASHCARD QUESTION
Front
If you have 2 moles of sodium chloride (NaCl), how many grams do you have?
Back
2 moles x 58.44 g/mol = 116.88 g.
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