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3 years ago

A sample of O2, under occupies 500ml at 25.0°C. What volume will the sample occupy at 0.0°C

Chemistry

1 answer:

NeX [460]3 years ago

7 0

Answer:

458ml

Explanation:

According to charles law, $\frac{V_{1}}{T_{1}} =\frac{V_{2}}{T_{2}}$

Given values,

Volume occupied $V_{2}=500ml$

Temperature $T_{1}=25.0^{\circ}C=25+273=298K$

Second temperature $T_{2}=0.0^{\circ}C=273K$

Volume $V_{2}=?$

From charles law, $V_{2}=\frac{V_{1} \times T_{2}}{T_{1}}$ \\$=\frac{500 \times 273}{298}$\\$=458ml$

$\therefore$ Volume occupied by the oxygen at 0.0°C is 458ml

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Calculate by (a)% weight and (b) %mole each of the elements present in sugar

Musya8 [376]

Explanation:

Molecular mass of sugar = $C_{12}H_{22}O_{11}$ : = 432 g/mol

Atomic mass of carbon atom = 12 g/mol

Atomic mass of hydrogen atom = 1 g/mol

Atomic mass of oxygen atom = 16 g/mol

a) Percentage of an element in a compound:

$\frac{\text{Number of atoms of element}\times \text{Atomic mass of element}}{\text{molecular mass of compound}}\times 100$

Percentage of carbon by weight in $C_{12}H_{22}O_{11}$ :

$\frac{12\times 12 g/mol}{342 g/mol}\times 100=42.10\%$

Percentage of hydrogen by weight in $C_{12}H_{22}O_{11}$ :

$\frac{22\times 1g/mol}{342 g/mol}\times 100=6.43\%$

Percentage of oxygen by weight in $C_{12}H_{22}O_{11}$ :

$\frac{11\times 16g/mol}{342 g/mol}\times 100=51.46\%$

b) Percentage of mole each of the elements present in sugar:

= $\frac{\text{Moles of atoms of an element}}{\text{total moles of all types of atoms}}\times 100$

In mole of sugar we have 12 moles of carbon atom , 22 moles of hydrogen atoms and 11 moles of oxygen atoms.

Percentage of carbon by mole in $C_{12}H_{22}O_{11}$ :

$\frac{12 mol}{45 mol}\times 100=26.66\%$

Percentage of hydrogen by mole in $C_{12}H_{22}O_{11}$ :

$\frac{22 mol}{45 mol}\times 100=48.88\%$

Percentage of oxygen by mole in $C_{12}H_{22}O_{11}$ :

$\frac{11 mol}{45 mol}\times 100=24.44\%$

7 0

4 years ago

Dwayne filled a small balloon with air at 298.5 K. He put the balloon into a bucket of water, and the water level in the bucket

Tcecarenko [31]

Answer : The volume of the balloon will be, 0.494 liters

Solution :

Charles' Law : It is defined as the volume of the gas is directly proportional to the temperature of the gas at constant pressure and number of moles.

$V\propto T$

or,

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$

where,

$V_1$ = initial volume of gas = ?

$V_2$ = final volume of gas = 0.54 L

$T_1$ = initial temperature of gas = 273.15 K

$T_2$ = final temperature of gas = 298.5 K

Now put all the given values in the above equation, we get the initial volume of balloon.

$\frac{V_1}{273.15K}=\frac{0.54L}{298.5K}$

$V_1=0.494L$

Therefore, the volume of the balloon will be, 0.494 liters

5 0

3 years ago

Read 2 more answers

Three metal spoons are on table. They are at room temperature. If the three spoons touch.

Alex

If the spoons touch, no heat will flow among the spoons because they are already in thermal equilibrium with each other. This is hinted by the statement "they are at room temperature" which means they all have the same temperature. Heat only flows when there is a difference in temperature.<span>
The answer will be </span><span>C. No heat will flow among the spoons
</span><span>
®PLEASE MARK AS BRAINLIEST TO HELP ME LEVEL UP®</span>

5 0

3 years ago

Read 2 more answers

Chemistry Help. Need Help like a.s.a.p. Don't really Understand this. really need some help. Picture is attached.

Verdich [7]

Look on the periodic table

7 0

3 years ago

If an emergency vehicle passes you in traffic, just as it passes you the pitch of

Keith_Richards [23]

If an emergency vehicle passes you in traffic, just as it passes you the pitch of the siren changes as it approaches, the siren’s pitch sounds higher than when it is moving away from you.the frequency increases as the siren is moving toward you, and decreases as it is moving away, is correct

This change is a common physical demonstration of the Doppler effect.

<h3>What is Doppler effect ?</h3>

This effect refers to the increase in the frequency of sound, as the source and observer move toward (or away from) each other.

The effect causes the sudden change in pitch noticeable in a passing siren.

Hence Option (B) i.e, the frequency increases as the siren is moving toward you, and decreases as it is moving away, is correct

Learn more about Doppler' effect here ;

brainly.com/question/27507962

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3 0

2 years ago