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Ch.1 - Intro to General Chemistry	2hrs & 53mins	0% complete	Worksheet Start
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Ch.7 - Quantum Mechanics	2hrs & 35mins	0% complete	Worksheet Start
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Ch.22 - Chemistry of the Nonmetals	2hrs & 1min	0% complete	Worksheet Start
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Mole Concept

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Sections
Periodic Table	28 mins	0 completed	Learn
Mole Concept	37 mins	0 completed	Learn Summary
Isotopes	12 mins	0 completed	Learn Summary
Mass Spectrometry	9 mins	0 completed	Learn
Subatomic Particles	8 mins	0 completed	Learn
Atomic Theory	16 mins	0 completed	Learn
Thomson's Cathode Ray Tube Experiment	8 mins	0 completed	Learn
Oil Drop Experiment	7 mins	0 completed	Learn
The Chadwick Neutron Experiment	6 mins	0 completed	Learn
Gold Foil Experiment	10 mins	0 completed	Learn
End of Chapter 2 Problems	28 mins	0 completed	Learn

Additional Guides
Periodic Table Charges
Calculating Molar Mass
Calculating Grams to Moles

Learn Additional Practice Summary

Next SectionIsotopes

Solution: How many moles are in 25 mg of O 2? (Atomic mass of O = 16.00 g/mol) A) 7.8 ×10−4 B) 1.6 ×10−3 C) 0.40 D) 0.80 E) 800

Name: How many moles are in 25 mg of O 2? (Atomic mass of O = 16.00 g/mol) A) 7.8 ×10−4 B) 1.6 ×10−3 C) 0.40 D) 0.80 E) 800
Uploaded: 2015-09-23T11:34:52.000-04:00
Duration: 1 min 7 s
Description: Watch the video solution for the question: How many moles are in 25 mg of O 2? (Atomic mass of O = 16.00 g/mol) A) 7.8 ×10−4 B) 1.6 ×10−3 C) 0.40 D) 0.80 E) 800

Problem

How many moles are in 25 mg of O ₂? (Atomic mass of O = 16.00 g/mol)

A) 7.8 ×10⁻⁴

B) 1.6 ×10⁻³

C) 0.40

D) 0.80

E) 800

Mole Concept

Solution: How many moles are in 25 mg of O 2? (Atomic mass of O = 16.00 g/mol) A) 7.8 ×10−4 B) 1.6 ×10−3 C) 0.40 D) 0.80 E) 800

Problem

Practice Problems