Moles and Percent Composition

Presentation

•

Chemistry

•

9th - 11th Grade

•

Medium

•

NGSS

HS-PS1-7

Standards-aligned

Christopher Nguyen

Used 102+ times

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6 Slides • 10 Questions

Moles and Percent Composition

The Mole

1 mole= 6.02 x 10²³ particles of ANY element, compound, etc.
1 mole= the molar mass of any element

Multiple Choice

How many grams are in 1.2 x 10²⁴ atoms of C?

29.34 grams

23.94 grams

6.02 grams

1.21 grams

Multiple Choice

How many moles are in 3.01 x 10²² atoms of magnesium?

0.05 moles

1.81 x 10⁴⁶ moles

5.00 x 10²¹ moles

5.00 moles

Multiple Choice

How many moles are in 19.82 g Mg?

1.23 mol Mg

481.70 mol Mg

1.00 mol Mg

0.82 mol Mg

Multiple Choice

How many molecules are in 2.5 mol of NaCl?

1.50 x10²⁴molecules

1.50 molecules

4.15 molecules

1.51 x10²⁴molecules

Percent Composition

The percent of a specific element in a chemical formula

Multiple Choice

Calculate the number of atoms in 0.0340 g Zn.

5.200 x 10^-4 atoms Zn

3.130 x 10²³ atoms Zn

3.130 x 10²⁰ atoms Zn

1 atom Zn

Percent Composition

The percent of a specific element in a chemical formula

How to find percent composition

Step 1: Find the total molar mass of the compound
Step 2: Place the entire mass of the specific element you want to find in the numerator and the total molar mass you found in step one in the denominator
Divide the numbers and multiply by 100

Multiple Choice

What is the percent composition by mass of sulfur (S) in the compound MgSO₄?

20.22%

19.85%

26.64%

28.64%

Multiple Choice

Find the percent composition of Cu₂S?

%Cu= 67.987 %S= 32.013

%Cu= 79.854 %S= 20.145

%Cu= 35.946 %S= 64.054

Multiple Choice

What is the percent composition by mass of oxygen in the compound MgSO₄ (gram formula mass = 120 g/mol)?

20%

27%

46%

53%

Multiple Choice

What is the percent by mass of fluorine in CaF₂(gram-formula mass = 78 g/mol)?

24%

49%

51%

65%

Multiple Choice

What is the percent by mass of oxygen in MgO?

20%

40%

50%

60%

Moles and Percent Composition

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