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3 years ago

How do we know if molecules have kinetic energy?

1 answer:

6 0

By looking at their temperature. The hotter/warmer something is, the more average kinetic energy the thing has. The cooler it is, the slower. Hope this helps!

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A chemist adds of a sodium thiosulfate solution to a reaction flask. Calculate the mass in grams of sodium thiosulfate the chemi

schepotkina [342]

This is a incomplete question.The complete question is:

A chemist adds 180.0 ml of a 1.77 mol/L of sodium thiosulfate solution to a reaction flask. Calculate the mass in grams of sodium thiosulfate the chemist has added to the flask. Be sure your answer has the correct number of significant digits.

Answer: 50.4 g

Explanation:

To calculate the number of moles for given molarity, we use the equation:

$\text{Moles of solute}={\text{Molarity of the solution}}\times{\text{Volume of solution (in L)}}$ .....(1)

Molarity of sodium thiosulfate solution = 1.77 M

Volume of sodium thiosulfate solution = 180.0 mL = 0.1800 L

Putting values in equation 1, we get:

$\text{Moles of sodium thiosulfate}={1.77}\times{0.1800}=0.319moles$

Mass of sodium thiosulfate = $moles\times {\text {Molar mass}}=0.319moles\times 158.11g/mol=50.4g$

Thus 50.4 g of sodium thiosulfate the chemist has added to the flask.

6 0

3 years ago

I need this ASAP thank you

son4ous [18]

The first one I god it wrong and he told us the answer

4 0

3 years ago

The temperature at which a liquid changes into a gas is called the _____. boiling point melting point freezing point condensatio

love history [14]

The answer is the boiling point because when you want to change the liquid into a gas you should boil it :)))
i hope this is helpful
have a nice day

5 0

4 years ago

Read 2 more answers

Whats the length of an aluminum rod at 65 c if its length at 15 c is 1.2 meters

Furkat [3]

15c - 1.2m
1c - 1.2/15 = 0.08m
65c - 5.2m

4 0

4 years ago

"Calculate the pH during the titration of 30.00 mL of 0.1000 M C3H7COOH(aq) with 0.1000 M LiOH(aq) after 29.9 mL of the base hav

Ivanshal [37]

Answer:

pH = 7.29

Explanation:

<em>Ka of butanoic acid is 1.54x10⁻⁵</em>

To obtain the pH of the solution you must use H-H equation for butanoic acid:

pH = pKa + log₁₀ [C₃H₇COO⁻] / [C₃H₇COOH]

Where pKa is defined as -log Ka = 4.81

Now, you need to find [C₃H₇COO⁻] and [C₃H₇COOH] concentrations (Also, you can find moles of each substance and replace them in the equation.

Butanoic acid reacts with LiOH, producing C₃H₇COO⁻, thus:

C₃H₇COOH + LiOH → C₃H₇COO⁻ + H₂O + Li⁺

Moles of both reactants, C₃H₇COOH and LiOH are:

C₃H₇COOH = 0.0300L ₓ (0.1000mol / L) = 0.003000moles of C₃H₇COOH

LiOH = 0.0299L ₓ (0.1000mol / L) = 0.00299 moles of LiOH.

That means moles of C₃H₇COO⁻ produced are <em>0.00299 moles</em>.

And moles of C₃H₇COOH that remains in solution are:

0.00300 - 0.00299 = <em>0.00001 moles of C₃H₇COOH</em>

Replacing in H-H equation:

pH = pKa + log₁₀ [C₃H₇COO⁻] / [C₃H₇COOH]

pH = 4.81 + log₁₀ [0.00299moles] / [0.00001moles]

7 0

4 years ago