3 years ago

Which of the following is an endothermic reaction?

Chemistry

1 answer:

Black_prince [1.1K]3 years ago

7 0

Dissolving table NaCl into water is an endothermic reaction

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A sample of helium gas at 27.0 °C and 3.60 atm pressure is cooled in the same container to a temperature of -73.0 °C. What is th

trasher [3.6K]

Answer: The new pressure, if volume and amount of gas do not change is 2.40 atm

Explanation:

To calculate the final temperature of the system, we use the equation given by Gay-Lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

$\frac{P_1}{T_1}=\frac{P_2}{T_2}$

where,

$P_1\text{ and }T_1$ are the initial pressure and temperature of the gas.

$P_2\text{ and }T_2$ are the final pressure and temperature of the gas.

We are given:

$P_1=3.60atm\\T_1=27^0C=(27+273)K=300K\\P_2=?\\T_2=-73.0^0C=(273-73)=200K$

Putting values in above equation, we get:

$\frac{3.60}{300K}=\frac{P_2}{200K}\\\\P_2=2.40atm$

Thus the new pressure, if volume and amount of gas do not change is 2.40 atm

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3 years ago

What % of table salt (NaCl) is sodium?

Irina18 [472]

Answer:

I think it's 39%

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The melting point of h2o is 0 degrees celsius. this is the same as its:

professor190 [17]

This is the same as its freezing point

hope this helps

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Diamond is an allotrope of :

Marat540 [252]

Answer:

carbon

Explanation:

because it is an allotrope of carbon

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2 years ago

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The expression for 11 million km in scientific notation is

kakasveta [241]

1.1 * 10^7 km

I think.

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