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21 September, 11:16

A penny has a mass of 2.50g and the moon has a mass of 7.35 X 10^22

Use this information to answer the questions below. Be sure your answers have the 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? Write your answer as a decimal, and round to one place?

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  1. 21 September, 11:39
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    The mass of 1 mole of pennies is 1.50*10²⁴ g

    1.1*10²¹ moles of pennies have a mass equal to the mass of the moon.

    Explanation:

    As we know, 1 mol = 6.02*10²³ units

    Let's think this rule of three:

    1 penny weighs 2.50 g

    So, 6.02*10²³ pennies would weigh (6.02*10²³. 2.5) = 1.50*10²⁴ g

    We consider that a penny is made of Cu, 100 % Cu.

    Let's find out the moles of 1 penny (mass / molar mass)

    2.50 g / 63.55 g/mol = 0.0393 moles

    Finally we can do this rule of three:

    2.50 g are contained in 0.0393 moles of pennies

    7.35*10²² g would be contained in (7.35*10²². 0.0393) / 2.50 = 1.1*10²¹ moles
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