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jonny [76]
2 years ago
11

HELP

Chemistry
1 answer:
Wittaler [7]2 years ago
8 0

Answer:

Explanation:

1.

 Given parameters:

Number of moles of CaO = 0.22moles

Unknown:

Mass of CaO = ?

Solution:

Mass, number of moles and molar mass are related using the expression below;

  Mass  = number of moles x molar mass

Molar mass of CaO  = 40 + 16  = 56g/mol

  Insert the parameters and solve;

  Mass = 0.22 x 56  = 12.32g

2

Given parameters:

Number of moles of NaCl  = 0.83moles

Unknown:

mass of NaCl  = ?

Solution:

Also,

 Mass  = number of moles x molar mass

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

Now insert the parameters and solve;

    mass = 0.83 x 58.5

     mass  = 48.6g

3.

Given parameters:

Number of moles of H₂SO₄  = 0.5moles

Unknown:

mass of H₂SO₄ = ?

Solution:

Mass  = number of moles x molar mass

Molar mass of H₂SO₄  = 2(1) + 32 + 4(16) = 98g/mol

Insert the parameters and solve;

  Mass = 0.5 x 98  = 49g

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3 years ago
1. Nitrogen, oxygen, and fluorine atoms all seem pretty similar, at first. How many valence electrons does an atom of each have?
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2 years ago
Kory goes outside to grill some hamburgers. He tells Ethan that when you cook meat, a chemical reation is taking place. Ethan sa
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Answer:

Explanation:

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7 0
2 years ago
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Answer:

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3 0
2 years ago
A silicon wafer with dimensions 15.00 cm x 15.00 cm x 0.0400 cm
Oxana [17]

The silicon wafer contains 20.96 g of silicon.

The mole of a substance is related to its mass and molar mass by the following equation:

<h3>Mole = mass / molar mass ....... (1)</h3>

Making mass the subject of the above equation, we have

<h3>Mass = mole × molar mass ..... (2)</h3>

With the above formula (i.e equation 2), we can obtain the mass of silicon in the wafer as follow:

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Mass = mole × molar mass

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Therefore, the mass of silicon in the wafer is 20.96 g

Learn more: brainly.com/question/24639749

3 0
2 years ago
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