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3 years ago

What volume of 6.0M NaOH is required to make 300.0mL of 0.500M NaOH?

Chemistry

1 answer:

g100num [7]3 years ago

4 0

Answer:

Option B. 25mL

Explanation:

Step 1:

Data obtained from the question:

Molarity of stock solution (M1) = 6M

Volume of stock solution needed (V1) =..?

Molarity of the diluted solution (M2) = 0.5M

Volume of diluted solution (V2) = 300mL

Step 2:

Determination of the volume of the stock solution needed.

Using the dilution formula, we can easily find the volume of the stock solution needed as follow:

M1V1 = M2V2

6 x V1 = 0.5 x 300

Divide both side by 6

V1 = (0.5 x 300) /6

V1 = 25mL

Therefore, 25mL of 6M NaOH is needed.

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2 years ago

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3 years ago

Some solutes have large heats of solution, and care should be taken in preparing solutions of these substances. The heat evolved

OLga [1]

Answer:

Final temperature of water is 83.8°C

Explanation:

In 500.0mL of a 6.00M NaOH solution, there are:

0.5000L × (6.00mol NaOH/ L) = 3.00moles of NaOH

As the heat involved in dissolution is 44.5 kJ/mol, when the solution is dissolved:

44.5kJ/mol × 3.00moles = 133.5kJ = 133500J

Using coffee-cup calorimeter equation:

q = m×C×ΔT

Where q is heat, m is mass of water (500.0g), C is specific heat of water (4.186J/g°C) and ΔT is change in temperature

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3 years ago

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castortr0y [4]

First question I believe is B

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4 years ago

the isotope 146c has a half life of 5730 years. what fraction of 146c in a sample with mass ,m, after 28650 years

defon

Answer:

3.1% is the fraction of the sample after 28650 years

Explanation:

The isotope decay follows the equation:

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Where [A] could be taken as fraction of isotope after time t, k is decay constant and [A]₀ is initial fraction of the isotope = 1

k could be obtained from Half-Life as follows:

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<h3>3.1% is the fraction of the sample after 28650 years</h3>

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3 years ago