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4 years ago

Can somebody answer this please

Chemistry

1 answer:

Murrr4er [49]4 years ago

7 0

The answer should be A.

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Suppose you have 50 grams of a radioactive isotope with a half-life of 2 years. How much of the isotope will you have after 4 ye

lys-0071 [83]

C would be the best answer

5 0

3 years ago

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Balance the following equation<br><br> CH₄ + O₂ → CO₂ + H₂O

nalin [4]

Answer:

CH4 + 2 O2 - - - > CO2 + 2 H2O

Explanation:

hope this helps,

you can check by adding all the numbers on both sides

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3 0

3 years ago

A 10.0 L flask at 318 K contains a mixture of Ar and CH4 with a total pressure of 1.040 atm. If the mole fraction of Ar is 0.715

andrey2020 [161]

Answer:

$w_{Ar}=0.814$

Explanation:

Hello,

In this case, given the temperature, volume and total pressure, we can compute the total moles by using the ideal gas equation:

$PV=nRT\\\\n=\frac{PV}{RT}=\frac{1.040atm*10.0L}{0.082\frac{atm*L}{mol*K}*318K}\\ \\n=0.41mol$

Next, using the molar fraction of argon, we compute the moles of argon:

$n_{Ar}=0.41mol*0.715=0.29mol$

And the moles of methane:

$n_{CH_4}=0.41mol-0.29mol=0.12mol$

Now, by using the molar masses of both argon and methane, we can compute the mass percent of argon:

$w_{Ar}=\frac{m_{Ar}}{m_{Ar}+m_{CH_4}}=\frac{0.29mol*\frac{40g}{1mol} }{0.29mol*\frac{40g}{1mol}+0.12mol*\frac{16g}{1mol}} \\\\w_{Ar}=0.814$

Regards.

7 0

3 years ago

How is good at electron configurations in chemistry?

Paha777 [63]

Try to understand all the rules and laws like:

Aufbau Principle

Hund's rule

Pauli exclusion principle...

Then, you should understand the way in which you can fill the electrons in the orbitals!!

8 0

3 years ago

a sample of a substance has a mass of 52.5g and displaces a volume of 4.2ml. what is the density of the substance

Lena [83]

Answer:

<h2>Density = 12.5 g/mL</h2>

Explanation:

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

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

From the question

mass = 52.5 g

volume = 4.2 mL

Substitute the values into the above formula and solve for the density

We have

$Density = \frac{52.5}{4.2} \\$

We have the final answer as

<h3>Density = 12.5 g/mL</h3>

Hope this helps you

3 0

4 years ago