8AB Mole Calculations

8AB Mole Calculations

Assessment

Flashcard

Chemistry

10th Grade

Practice Problem

Hard

Created by

Wayground Content

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the molar mass of a compound?

Back

The 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 atoms in the molecular formula.

2.

FLASHCARD QUESTION

Front

How do you calculate the molar mass of Zn(C₂H₃O₂)₂?

Back

To calculate the molar mass, sum the atomic masses: Zn (65.4 g/mol) + 2(C₂H₃O₂) = 2(2*12.01 + 3*1.01 + 16.00) = 2(24.02 + 3.06 + 16.00) = 2(43.08) = 86.16 g/mol. Total = 65.4 + 86.16 = 151.56 g/mol.

3.

FLASHCARD QUESTION

Front

What is the molar mass of calcium hydroxide, Ca(OH)₂?

Back

The molar mass is calculated as follows: Ca (40.08 g/mol) + 2(O) (16.00 g/mol) + 2(H) (1.01 g/mol) = 40.08 + 32.00 + 2.02 = 74.10 g/mol.

4.

FLASHCARD QUESTION

Front

How do you find the number of moles from mass?

Back

Use the formula: Number of moles = mass (g) / molar mass (g/mol).

5.

FLASHCARD QUESTION

Front

How many moles are in 20g of magnesium?

Back

Using the molar mass of magnesium (24.31 g/mol): Number of moles = 20 g / 24.31 g/mol = 0.82 moles.

6.

FLASHCARD QUESTION

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10²³, which is the number of particles (atoms, molecules, etc.) in one mole of a substance.

7.

FLASHCARD QUESTION

Front

How do you calculate the number of molecules from moles?

Back

Use the formula: Number of molecules = moles x Avogadro's number.

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