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Lina20 [59]
2 years ago
9

Calculate the oxidation number of Cao ​

Chemistry
1 answer:
wlad13 [49]2 years ago
5 0

Answer:+2 -2

Explanation:

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Number 4 is
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Property of a substance
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There are many properties to substances.

I'll list some examples below:

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The following statements all describe changes in matter. Some of these changes are physical, and some are chemical. Select the s
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The change of the statue of liberty from copper to green is an example of a chemical change.

<h3>Physical and chemical change</h3>

A physical change does not involve the formation of new substances and the composition of the substance does not change. However, in a chemical change, a new substance is formed and the composition of the substance changes.

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Soaps feel slippery on our hands because they dissolve the oil on our skin decreasing friction this is because soaps contain
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At 20°C the vapor pressure of benzene (C6H6) is 75 torr, and that of toluene (C7H8) is 22 torr. Assume that benzene and toluene
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Answer: The mole fraction of benzene will be 0.34 and mole fraction of toluene is 0.66

Explanation:

According to Raoult's law, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component multiplied by the vapor pressure of that component in the pure state.

p_1=x_1p_1^0 and p_2=x_2P_2^0

where, x = mole fraction in solution

p^0 = pressure in the pure state

According to Dalton's law, the total pressure is the sum of individual pressures.

p_{total}=p_1+p_2\\p_{total}=x_{benzene}p_{benzene}^0+x_{toluene}P_{toluene}^0

x_{benzene}=x,

x_{toluene}=1-x_{benzene}=1-x,

p_{benzene}^0=75torr

p_{toluene}^0=22torr

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40=x\times 75+(1-x)\times 22

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Thus the mole fraction of benzene will be 0.34 and that of toluene is 0.66

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