Mole Conversions and Percent Composition

Presentation

•

Chemistry

•

9th - 12th Grade

•

Hard

Joseph Anderson

FREE Resource

5 Slides • 4 Questions

Moles - Percent Composition

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 composition by mass of sulfur in the compound MgSO₄ (gram formula mass = 120 g/mol)?

20%

27%

46%

53%

Multiple Choice

A compound is a hydrate when it...

is composed of only hydrogen and oxygen

is a state of water

contains water in the compound

repels water from the compound

Multiple Choice

How do you calculate the percent by mass of an element in a compound?

Add up the mass of protons and neutrons, then divide by two.

Divide the mass of the element by the total mass of the compound and multiply by 100.

Add up the atomic masses of the elements, then divide by the number of the elements.

Find the relative mass of any atom by adding the number of protons to the number of neutrons, then dividing by that total number.

Moles - Percent Composition

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