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2 years ago

A penny has a mass of

Chemistry

2 answers:

Ahat [919]2 years ago

5 0

You did not include the questions.

I did some research and found the questions:

<span> What is the mass of 1 mole of pennies? How many moles of pennies have a mass equal to the mass of the moon?

Solutions:

1) mass of 1 mole of pennies

Data: mass of 1 penny = 2.50 g

1 mole = 6.022 * 10^ 23 units

Proportion:

1 penny      6.022 * 10^23 penny
-------------- = ----------------------------
   2.50 g                    x

Solve: x = 6.022 * 10^23 penny * 2.50g / 1 penny = 15.055* 10^23

Since 2.50 has 3 significant figures, the answer must use 3 significant figures => x = 15.1 * 10^ 23 g = 1.51 * 10^24 g

Answer: 1 mol of pennies have a mass of 1.51 * 10^24 g

2) How many moles of pennies have a mass equal to the same mass of the Moon

Convert the mass of the Moon grams: 7.35 * 10^22 kg = 7.35 * 10^ 25 g

       1 mol                            x
---------------------- = ----------------------
1.51 * 10^ 24g          7.35 * 10^ 25 g

=> x = 7.35 * 10^ 25 g * 1 mol / (1.51 * 10^24 g)= 48.7 mol

Answer: 48.7 mol
</span>

solniwko [45]2 years ago

5 0

a. 1 mole pennies = 1.51.10²⁴ grams

b. 48.7 Moles of Pennies have a mass equal to the mass of the moon

<h3>Further explanation</h3>

A mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12

1 mole = 6.02.10²³ particles

While the number of moles can also be obtained by dividing the mass (in grams) with molar mass

$\large {\boxed {\bold {mole \: = \: \frac {grams} {the \: relative \: mass \: of \: elements \: or \: the relative \: mass \: of \: molecules }}}}$

Questions to complete:

a. What is the mass of 1 mole of pennies?

b. How many moles of pennies have a mass equal to the mass of the moon?

a. For each penny has a mass of 2.5 grams, so for 1 mole of pennies it has a mass:

1-mole pennies = 6.02.10²³ pennies

mass:

6.02.10²³ pennies x 2.5 grams = 1.505.10²⁴ = 1.51.10²⁴ (round up to three significant figures)

b. 1 mole pennies has a mass of 1.505.10²⁴ grams, so for a mass equal to the moon of: 7.35.10²² kg there will be:

1.51.10²⁴ grams = 1.51.10²¹ kg

number of mole pennies = 7.35.10²²kg: 1.51.10²¹ kg = 48.68 = 48.7 (round up to three significant figures)

<h3>Learn more</h3>

Avogadro's number

brainly.com/question/859564

carbon atoms in 1.50 g of butane

brainly.com/question/5122019

a mole and Avogadro’s number

brainly.com/question/1445383

Keywords: mole, Avogadro’s number, A penny, moon, mass

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We are given:

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For calculating the mass of carbon:

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To formulate the empirical formula, we need to follow some steps:

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