Converting Moles, Atoms, and Molecules: Practice Problems

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Tags

NGSS.3-5-ETS1-1

How many things are there in a mole?

• 12

• 602 hexillion

• Both 602 hexillion and 6.02 x 10^23

• 6.02 x 10^23

What is the scientific notation for 602 hexillion?

• 6.02 x 10^22

• 6.02 x 10^25

• 6.02 x 10^23

• 6.02 x 10^24

What is the result of 0.63*(6.02E23) in scientific notation?

• 3.7926 x 10^25

• 3.7926 x 10^23

• 3.7926 x 10^22

• 3.7926 x 10^24

How many significant figures should the answer 3.7926 x 10^23 be rounded to?

• One

• Two

• Three

• Four

What is the rounded answer for 0.63 moles of molecules in scientific notation?

• 3.7 x 10^23

• 3.8 x 10^23

• 4.0 x 10^23

• 3.9 x 10^23

What is the purpose of using conversion factors in the calculation?

• To multiply moles

• To cancel out moles

• To add moles

• To subtract moles

How do you convert 3.9 x 10^20 Magnesium atoms to moles?

• Multiply by 6.02 x 10^23

• Subtract 6.02 x 10^23

• Divide by 6.02 x 10^23

• Add 6.02 x 10^23

What is the scientific notation for the result of (3.9E20)/(6.02E23)?

• 6.478405316 x 10^-3

• 6.478405316 x 10^-5

• 6.478405316 x 10^-6

• 6.478405316 x 10^-4

What is the rounded answer for 3.9 x 10^20 Magnesium atoms in moles?

• 6.4 x 10^-4

• 6.5 x 10^-4

• 6.6 x 10^-4

• 6.7 x 10^-4