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Lesechka [4]
3 years ago
9

The density of iron is 7.8 g/cm^3 (cubed), what is the mass of 5 cm^3 (cubed) of it? Include the symbol for the correct unit.

Chemistry
1 answer:
Monica [59]3 years ago
7 0

Answer:

<h2>The answer is 39 g</h2>

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

<h3>mass = Density × volume</h3>

From the question

volume of iron = 5 cm³

density = 7.8 g/cm³

It's mass is

mass = 5 × 7.8

We have the final answer as

<h3>39 g</h3>

Hope this helps you

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6. Consider the reaction: CzHo (g) + 02 (8) - 4 CO2(g) + 6H2O (1)
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1120 gm

Explanation:

6. Consider the reaction: CzHo (g) + 02 (8) - 4 CO2(g) + 6H2O (1)

(a) Balance the equation.

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FIRST, CORRECT THE EQUATION THEN BALANCE

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so for 10 moles of ethane, we need

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How many moles of aluminum metal are required to produce 4.04 L of hydrogen gas at 1.11 atm and 27 °C by reaction with HCl? ​
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Answer:

0.121 moles of aluminum metal are required to produce 4.04 L of hydrogen gas at 1.11 atm and 27 °C by reaction with HCl

Explanation:

This is the reaction:

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To make 3 moles of H₂, we need 2 moles of Al.

By conditions given, we will find out how many moles of H₂ do we have.

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1.11 atm . 4.04L = n . 0.082 L.atm/mol.K . 300K

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So the rule of three will be:

If 3 moles of H₂ came from 2 moles of Al

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