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2 years ago

If 22.5L of nitrogen at 748 mm Hg are compressed to 725mm Hg at constant temperature. What is the new volume?

Chemistry

1 answer:

Dahasolnce [82]2 years ago

6 0

Answer:

23.2L

Explanation:

The following were obtained from the question:

V1 = 22.5L

P1 = 748 mmHg

P2 = 725mmHg

V2 =?

The new volume can be obtained by doing the following:

P1V1 = P2V2

22.5 x 748 = 725 x V2

Divide both side by 725

V2 = (22.4 x 748) /725

V2 = 23.2L

The new volume is 23.2L

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Select the true statement:

Vsevolod [243]

Answer:

Bonds are broken and new bonds are formed during chemical reactions only.

Explanation:

A physical change in a substance doesn't change what the substance is.

In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

Physical changes can be reversed, chemical changes cannot be reversed with the substance changed back without extraordinary means, if at all. For example, a cup of water can be frozen when cooled and then can be returned to a liquid form when heated.

So, the right choice is:

Bonds are broken and new bonds are formed during chemical reactions only.

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3 years ago

How many grams contained on 78.4 moles of neon

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2 years ago

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5. Which statement is true about electronegativity?

Anit [1.1K]

Answer:

Electronegativity generally increases from left to right across a period,

Explanation:

The true statement from the given choices is that electronegativity generally increases from left to right across a period.

Electronegativity is the measure of the relative tendency with which an atom of the element attract valence electrons in a chemical bond.

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This is due to reduction in metallic properties as we move across the period from left to right.

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2 years ago

Write a balanced equation for the neutralization reaction between the following (you do not need to include states of matter):

givi [52]

Answer:

Both have the same balance on a weight with. 2 dimensional figures on the area formula

Explanation:

8 0

1 year ago

What is the composition, in atom percent, of an alloy that consists of a) 5.5 wt% Pb and b) 94.5 wt% of Sn? Assume that the atom

Anastaziya [24]

Answer : The percent composition of Pb and Sn in atom is, 3.21 % and 96.8 % respectively.

Explanation :

First we have to calculate the number of atoms in 5.5 wt% Pb and 94.5 wt% of Sn.

As, 207.2 g of lead contains $6.022\times 10^{23}$ atoms

So, 5.5 g of lead contains $\frac{5.5}{207.2}\times 6.022\times 10^{23}=1.59\times 10^{22}$ atoms

and,

As, 118.71 g of lead contains $6.022\times 10^{23}$ atoms

So, 94.5 g of lead contains $\frac{94.5}{118.71}\times 6.022\times 10^{23}=4.79\times 10^{23}$ atoms

Now we have to calculate the percent composition of Pb and Sn in atom.

$\% \text{Composition of Pb}=\frac{\text{Atoms of Pb}}{\text{Atoms of Pb}+\text{Atoms of Sn}}\times 100$

$\% \text{Composition of Pb}=\frac{1.59\times 10^{22}}{(1.59\times 10^{22})+(4.79\times 10^{23})}\times 100=3.21\%$

and,

$\% \text{Composition of Sn}=\frac{\text{Atoms of Sn}}{\text{Atoms of Pb}+\text{Atoms of Sn}}\times 100$

$\% \text{Composition of Sn}=\frac{4.79\times 10^{23}}{(1.59\times 10^{22})+(4.79\times 10^{23})}\times 100=96.8\%$

Thus, the percent composition of Pb and Sn in atom is, 3.21 % and 96.8 % respectively.

6 0

3 years ago