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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:

 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

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

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carbon atoms in 1.50 g of butane

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a mole and Avogadro’s number

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

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Explanation:

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2 years ago

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geniusboy [140]

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Explanation:

1) ratio

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Answer:

Explanation:

Hello!

Complete text:

Honors Stoichiometry Activity WorksheetInstructions:

Activity Two: Just Lemons, Inc. Production

Here's a one-batch sample of Just Lemons lemonade production. Determine the percent yield and amount of leftover ingredients for lemonade production and place your answers in the data chart.

Hint: Complete stoichiometry calculations for each ingredient to determine the theoretical yield. Complete a limiting reactant-to-excess reactant calculation for both excess ingredients.

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Sugar 196.86 g

Lemon Juice 193.37 g

Lemonade 2050.25g

Leftover Ingredients?

Just Lemons Lemonade Recipe Equation:

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1 mole of sugar = 1 cup = 225 g

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You have the information on the ingredients used to produce one batch of lemonade and the amount of lemonade produced. To determine which ingredients be leftovers, you have to determine first, which one is the limiting reactant, i.e. the ingredient that will be used up first.

According to the recipe, to make 4 moles of lemonade, you use 2 moles of water, one mole of sugar and one mole of lemon juice, expressed in grams:

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So for every 2877.68g of lemonade made, they use 473.18g of water, 225g of sugar, and 257.83g of lemon juice.

You know that they made a batch of 2050.25g, so to detect the limiting reactant, first, you have to calculate, in theory, how much of each ingredient you need to make the given amount of lemonade:

Use cross multiplication

Water:

2877.68g lemonade → 473.18g water

2050.25g lemonade → X= (2050.25*473.18)/2877.68= 337.12g water

Following the recipe, to elaborate 2050.25g of lemonade, you need to use 337.12g of water.

Sugar:

2877.68g lemonade → 225g sugar

2050.25g lemonade → X= (2050.25*225)/2877.68= 160.30g sugar.

To elaborate 2050.25f of lemonade you need to use 160.30g of sugar.

Lemon juice:

2877.68g lemonade → 257.83g lemon juice

2050.25g lemonade → X= (2050.25*257.83)/2877.68= 183.69g lemon juice.

To elaborate 2050.25f of lemonade you need to use 183.69g lemon juice.

Available ingredients vs. theoretical yields for 2050.25g of lemonade:

Water 946.36 g → 337.12g

Sugar 196.86 g → 160.30g

Lemon Juice 193.37 g → 183.69g

The lemon juice will be the first ingredient to be used up, there will be a surplus of water and sugar.

I hope this helps!

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