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3 years ago

Which of the following pairs of elements are chemically most similar to each other?

Chemistry

1 answer:

Natali [406]3 years ago

8 0

Answer:

Explanation:

elements in the same group are most similiar

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Which element has 21 neutrons and 20 electrons?

mario62 [17]

Scandium has 21 neutrons

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Describe the cell structure of a typical plant cell

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Answer:

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3 years ago

How many moles of methane (CH4) are in 7.31 x 10^25 molecules

Ivan

molar mass of methane CH4

= C + 4 H

= 12.0 + 4 x 1.008

= 12.0 + 4.032

= 16.042g/mol

7.31 x 10^25 molecules x <u> 1 mole CH4 </u> = 121.43 moles

6.02 x 10^23 CH4 molecules

121.43 moles CH4 are present.

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3 years ago

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Which theory describes the motion of and force driving earth’s plates?

swat32

The theory that describes the motion and force driving earth's plates is Plate tectonics

Explanation:

Plate tectonics states that the outer shell of the Earth is divided into plates that glide and move over the mantle which is the surface of the earth.

The mantle is the rocky inner layer above the core of the Earth.

Plate tectonics helped the geologists to explain how continents could move around the planet.

There are 9 major plate tectonics , namely North American, Pacific, Eurasian, Australian, African, Indo - Australian,Indian South American and Antarctic. These plates have been named after the land form found on them.

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3 years ago

Gaseous methane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 7.9 g of methane is

Vikki [24]

Explanation:

The given reaction is as follows.

$CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O$

As it is known that number of moles equal mass divided by molar mass. Molar mass of methane is 16 g/mol.

Hence, No. of moles = $\frac{mass}{molar mass}$

= $\frac{7.9 g}{16 g/mol}$

= 0.493 mol

Molar mass of oxygen is 32 g/mol.

Hence, its number of moles = $\frac{mass}{molar mass}$

= $\frac{14.4 g}{32 g/mol}$

= 0.45 mol

As, it is shown from the reaction that 1 mole of methane needs 2 mole of oxygen.

Therefore, 0.493 mol of methane needs $2 \times 0.45 mol$ equals 0.9 moles of oxygen.

As there is only 0.45 moles of oxygen for the reaction. So, it means that oxygen is the limiting reagent.

Hence, for 0.45 moles of oxygen, methane required is as follows.

$\frac{0.45}{2}$ = 0.225 moles

So, 0.225 moles of methane is equal to $0.225 \times 16$ = 3.6 g

As, 3.6 g of methane reacts with oxygen. Therefore, amount of methane remains is calculated as follows.

(7.9 g - 3.6 g) = 4.3 g

Thus, we can conclude that the minimum mass of methane that could be left over by the chemical reaction is 4.3 g.

8 0

3 years ago