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RSB [31]
3 years ago
13

14.2 grams of Na2SO4 is dissolved in water to make a 2.50 L

Chemistry
1 answer:
Trava [24]3 years ago
6 0

Answer:

0.04 M

Explanation:

Given data:

Mass of Na₂SO₄= 14.2 g

Volume of solution = 2.50 L

Molarity of solution = ?

Solution:

Number of moles of Na₂SO₄:

Number of moles = mass/ molar mass

Number of moles = 14.2 g/ 142.04 g/mol

Number of moles = 0.1 mol

Molarity :

Molarity = number of moles of solute / volume of solution in L

Molarity = 0.1 mol / 2.50 L

Molarity = 0.04 M

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How many particles are in a 151 g sample of Li2O?
neonofarm [45]

Answer:

3.052 × 10^24 particles

Explanation:

To get the number of particles (nA) in a substance, we multiply the number of moles of the substance by Avogadro's number (6.02 × 10^23)

The mass of Li2O given in this question is as follows: 151grams.

To convert this mass value to moles, we use;

moles = mass/molar mass

Molar mass of Li2O = 6.9(2) + 16

= 13.8 + 16

= 29.8g/mol

Mole = 151/29.8g

mole = 5.07moles

number of particles (nA) of Li2O = 5.07 × 6.02 × 10^23

= 30.52 × 10^23

= 3.052 × 10^24 particles.

4 0
3 years ago
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Rina8888 [55]

Answer:

See explanation.

Explanation:

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5 0
2 years ago
Match each processes with the correct transfer of energy.
sveticcg [70]

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condensation-energy lost(exothermic)

7 0
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Answer: B

Explanation:

6 0
3 years ago
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Answer:

It will create an alkaline environment and can lead to denaturation of acidic enzymes.

Explanation:

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3 years ago
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