A penny has a mass of 2.50g and moon has a mass of 7.35*10 to power of 22kg

Question

Use this information to answer the question be sure your answer has correct number of significant digits
What is the mass of 1 mole of pennies?
How many moles of pennies have a mass equal to the mass of the moon

Answer 1

To find the mass of 1 mole of pennies, we need to multiply the mass of one penny by Avogadro's number, which is 6.022 × 10^23.

Mass of 1 mole of pennies = (2.50g/penny) * (6.022 × 10^23 pennies/mol)
= 1.5055 × 10^24 g/mol
≈ 1.505 × 10^24 g/mol (to the correct number of significant digits)

To find the number of moles of pennies that have a mass equal to the mass of the moon (7.35 × 10^22 kg), we need to convert the mass of the moon into grams and then divide by the mass of 1 mole of pennies.

Mass of the moon = 7.35 × 10^22 kg = 7.35 × 10^22 kg * 1000 g/kg = 7.35 × 10^25 g

Number of moles of pennies = (7.35 × 10^25 g) / (1.505 × 10^24 g/mol)
= 4.88 × 10 moles
≈ 5 × 10^23 moles (to the correct number of significant digits)