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2 years ago

Express 410,000 in scientific notation

Chemistry

1 answer:

suter [353]2 years ago

6 0

Answer:

4.1 * 10^5

Explanation:

410,000

As we can see, there are 4 zero and 1 number 1 after the first number so the number when written in scientific notation would be:

4.1 * 10^5

Hope this can help you :3

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Take 5.25 grams and give it proportionally to the carbon
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The number of atoms in a mole of a substance is called Avogadro's number.
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2 years ago

According to the following reaction, what volume in milliliters of 0.244M KCl(aq) solution is required to react exactly with 50.

Elodia [21]

Answer:

There is 86.1 mL of KCl needed

Explanation:

<u>Step 1:</u> Data given

Molarity of KCl = 0.244 M

Volume of a 0.210 M Pb(NO3)2 = 50.0 mL = 0.05 L

<u>Step 2:</u> The balanced equation

2KCl(aq) + Pb(NO3)2(aq) -> PbCl2(s) + 2KNO3(aq)

<u>Step 3:</u> Calculate moles Pb(NO3)2

moles Pb(NO3)2 =molarity * volume

moles Pb(NO3)2 = 0.210 M * 0.05 L

moles Pb(NO3)2 = 0.0105 moles

<u>Step 4:</u> Calculate moles of KCl

For 1 mole of Pb(NO3)2 we need 2 moles of KCl

moles KCl required = 0.0105 * 2 =0.0210 moles

<u>Step 5:</u> Calculate volume of KCl

Volume = moles KCl / molarity KCl

V = 0.0210 moles / 0.244 M=0.0861 L = 86.1 mL

There is 86.1 mL of KCl needed

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2 years ago

What is the density of a substance that weighs 340g and has a volume of 40cm3?

jeka94

Answer:

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question we have

$density = \frac{340}{40} = \frac{17}{2} \\$

We have the final answer as

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Answer:

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