Avogadro's Number and the Mole Review

How much is one mole?

• 6.02 x 10²³

• 3 x 10⁸

• 6.67 x 10^-11

• 6.63 x 10^-34

Answer explanation

One mole is equal to Avogadro's number, which is approximately 6.02 x 10^23. This is the correct choice for the amount in one mole.

Tags

112.35.c.8.B

How many particles are there in 0.250 mol of Ag?

• 1.505 x 10^23 particles Ag

• 6.02 x 10^23 particles Ag

• 3.01 x 10^23 particles Ag

• 1.204 x 10^24 particles Ag

Answer explanation

0.250 mol of Ag contains 1.505 x 10^23 particles of Ag, as 1 mol of Ag contains 6.02 x 10^23 particles.

How many particles are there in 0.00858 mol NaCl?

• 5.16 x 10^21 particles NaCl

• 5.15 x 10^21 particles NaCl

• 5.15 x 10^22 particles NaCl

• 5.15 x 10^20 particles NaCl

Answer explanation

0.00858 mol NaCl x 6.022 x 10^23 particles/mol = 5.15 x 10^21 particles NaCl

How many particles are there in 35.4 mol of CO2?

• 2.13 x 10^23 particles CO2

• 2.13 x 10^24 particles CO2

• 2.13 x 10^25 particles CO2

• 2.13 x 10^22 particles CO2

Answer explanation

To find the number of particles in 35.4 mol of CO2, use Avogadro's number (6.022 x 10^23 particles/mol) and multiply by the given amount: 35.4 mol * 6.022 x 10^23 particles/mol = 2.13 x 10^24 particles CO2.

How many particles are there in 0.425 kmol of N2?

• 2.56 x 10^23 particles N2

• 2.56 x 10^24 particles N2

• 2.56 x 10^25 particles N2

• 2.56 x 10^26 particles N2

Answer explanation

0.425 kmol of N2 contains 0.425 x 6.022 x 10^23 particles = 2.56 x 10^23 particles N2

How many moles of Pb are there in 3.25 x 10^20 atoms of Pb?

• 5.40 x 10^-4 mol Pb

• 5.40 x 10^-3 mol Pb

• 5.40 x 10^-5 mol Pb

• 5.40 x 10^-6 mol Pb

Answer explanation

To find the number of moles, divide the number of atoms by Avogadro's number (6.022 x 10^23). 3.25 x 10^20 / 6.022 x 10^23 = 5.40 x 10^-4 mol Pb.

How many moles of glucose (C6H12O6) are there in 4.96 x 10^24 molecules of glucose?

• 8.24 mol glucose

• 8.24 x 10^23 mol glucose

• 8.24 x 10^22 mol glucose

• 8.24 x 10^21 mol glucose

Answer explanation

To find the number of moles, divide the number of molecules by Avogadro's number (6.022 x 10^23). 4.96 x 10^24 / 6.022 x 10^23 = 8.24 mol glucose.

How many moles of NaOH are there in 1.56 x 10^23 units of NaOH?

• 0.259 mol NaOH

• 0.259 x 10^23 mol NaOH

• 2.59 mol NaOH

• 25.9 mol NaOH

Answer explanation

To find the moles of NaOH, divide the given units by Avogadro's number (6.022 x 10^23). 1.56 x 10^23 / 6.022 x 10^23 = 0.259 mol NaOH.

How many moles of Cu are there in 1.25 x 10^25 atoms of Cu?

• 20.8 mol Cu

• 208 mol Cu

• 2.08 mol Cu

• 2080 mol Cu

Answer explanation

To find the number of moles, divide the number of atoms by Avogadro's number (6.022 x 10^23). 1.25 x 10^25 / 6.022 x 10^23 = 20.8 mol Cu.

How many moles of Si are there in 1.51 x 10^15 atoms of Si?

• 2.51 x 10^-9 mol Si

• 2.51 x 10^-8 mol Si

• 2.51 x 10^-7 mol Si

• 2.51 x 10^-6 mol Si

Answer explanation

To find the moles of Si, divide the number of atoms by Avogadro's number (6.022 x 10^23). 1.51 x 10^15 / 6.022 x 10^23 = 2.51 x 10^-9 mol Si.