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poizon [28]
3 years ago
5

Which of these can be mined from earth and used as an energy source?

Chemistry
1 answer:
Nastasia [14]3 years ago
4 0

coal

Which of these can be mined from earth and used as an energy source?

A.Get rid of the waste and extra fluid

B.Ureters

C.Coal

D.Bladder

ans is coal

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An experiment shows that a 236 mL gas sample has a mass of 0.443 g at a pressure of 740 mmHg and a temperature of 22 ∘C. What is
aleksley [76]

Answer:

49.2 g/mol

Explanation:

Let's first take account of what we have and convert them into the correct units.

Volume= 236 mL x (\frac{1 L}{1000 mL}) = .236 L

Pressure= 740 mm Hg x (\frac{1 atm}{760 mm Hg})= 0.97 atm

Temperature= 22C + 273= 295 K

mass= 0.443 g

Molar mass is in grams per mole, or MM= \frac{mass}{moles} or MM= \frac{m}{n}. They're all the same.

We have mass (0.443 g) we just need moles. We can find moles with the ideal gas constant PV=nRT. We want to solve for n, so we'll rearrange it to be

n=\frac{PV}{RT}, where R (constant)= 0.082 L atm mol-1 K-1

Let's plug in what we know.

n=\frac{(0.97 atm)(0.236 L)}{(0.082)(295K)}

n= 0.009 mol

Let's look back at MM= \frac{m}{n} and plug in what we know.

MM= \frac{0.443 g}{0.009 mol}

MM= 49.2 g/mol

3 0
3 years ago
8
GalinKa [24]

The bowl of mixed fruits is a mixture because there are several things making up the object. Hence, option (B) is correct.

What is a mixture?

  • The matter is categorized as mixtures and pure substances.
  • A mixture is defined as a combination of substances that are not chemically mixed.
  • A mixture can exist in solid, liquid, or gas form.
  • A mixture can exist in the same or in a different phase. It can be homogenous or heterogeneous.
  • If the substances are combined in the same phase, then the mixture is a homogeneous mixture.
  • But if the substances are combined in different phases, then it is a heterogeneous mixture.

Therefore, the mixed fruit bowl is a mixture, because there are several things making up the object.

Hence, option (B) is correct.

To learn more about mixture, visit: brainly.com/question/12160179

#SPJ9

8 0
2 years ago
How many different elements are there in the formula AgNO3
kotegsom [21]

Answer:

3

Explanation:

Ag

N

O

6 0
3 years ago
Lithium has 2 stable isotopes Li-6 and Li-7. One of them has an abundance of 92.5% and the other has an abundance of 7.5%. Knowi
nordsb [41]

Answer :  The more abundant isotope is, Li isotope-7

Explanation :

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

For Li isotope-7 :

Mass of Li isotope-7 = 7 amu

Fractional abundance of Li isotope-7 = 92.5 %

For Li isotope-6 :

Mass of Li isotope-6 = 6 amu

Fractional abundance of Li isotope-6 = 7.5 %

Average atomic mass of Li = 6.941 amu

As we know that the more abundant isotope is that whose percentage abundant will be more and atomic mass of isotope will be near to average atomic mass of isotope.

From this we conclude that, the percentage abundant of Li isotope-7 is more and their atomic mass is near to average atomic mass.

Hence, the more abundant isotope is, Li isotope-7

7 0
4 years ago
Why is it better to allow the solvent front to move almost to the top of a paper strip rather than stopping it at the halfway po
m_a_m_a [10]

Answer:

To allow all the elements or compounds to separate complete.

Explanation:

In chromatography, the compounds need some space and time to separate, one from each other, if you  just use the half of the paper strip maybe you will not notice the different spots of compounds. Remember all the substances have different affinity for the solvents, that means, some react very quickly but others need more time as the colors that conform the black color in an ink.

4 0
3 years ago
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