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3 years ago

A racehorse completes the Kentucky Derby, a distance of 1.25 miles, in

Chemistry

1 answer:

forsale [732]3 years ago

4 0

Answer:

D. 60.3 kilometers per hour

Explanation:

Hello,

In this case, we first compute the miles in kilometres:

$1.25miles*\frac{1.60934km}{1mile} =2.012km$

Then the minutes in hours:

$2.00min*\frac{1h}{60min}=0.033h$

Finally, the velocity:

$v=\frac{2.012km}{0.033h}\\ \\v=60.3km/h$

Thus, answer is D. 60.3 kilometers per hour

Best regards.

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When you are converting grams to moles , are you multiplying or dividing ?

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3 years ago

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2 years ago

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PH CHEM, PLEASE HELP QUICK! NO LINKS/VIRUSES PLEASE!

Contact [7]

Answer:

The pH of the solution is 11.48.

Explanation:

The reaction between NaOH and HCl is:

NaOH + HCl → H₂O + NaCl

From the reaction of 3.60x10⁻³ moles of NaOH and 5.95x10⁻⁴ moles of HCl we have that all the HCl will react and some of NaOH will be leftover:

$n_{NaOH}} = n_{i_{NaOH}} - n_{HCl} = 3.60 \cdot 10^{-3} moles - 5.95 \cdot 10^{-4} moles = 3.01 \cdot 10^{-3} moles$

Now, we need to find the concentration of the OH⁻ ions.

$[OH^{-}] = \frac{n_{NaOH}}{V}$

Where V is the volume of the solution = 1.00 L

$[OH^{-}] = \frac{n_{NaOH}}{V} = \frac{3.01 \cdot 10^{-3} moles}{1.00 L} = 3.01 \cdot 10^{-3} mol/L$

Finally, we can calculate the pH of the solution as follows:

$pOH = -log([OH^{-}]) = -log(3.01 \cdot 10^{-3}) = 2.52$

$pH + pOH = 14$

$pH = 14 - pOH = 14 - 2.52 = 11.48$

Therefore, the pH of the solution is 11.48.

I hope it helps you!

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3 years ago

Why is rain water slightly acidic

viva [34]

Answer:

Explanation:

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