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babunello [35]
3 years ago
10

How is the chemical formula of a compound determined?

Chemistry
1 answer:
Andrej [43]3 years ago
6 0
I hope this help to you

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A rigid tank contains 1.40 moles of an ideal gas. Determine the number of moles of gas that must be withdrawn from the tank to l
sergey [27]

Answer : The final number of moles of gas that withdrawn from the tank to lower the pressure of the gas must be, 0.301 mol.

Explanation :

As we know that:

PV=nRT

At constant volume and temperature of gas, the pressure will be directly proportional to the number of moles of gas.

The relation between  pressure and number of moles of gas will be:

\frac{P_1}{P_2}=\frac{n_1}{n_2}

where,

P_1 = initial pressure of gas = 24.5 atm

P_2 = final pressure of gas = 5.30 atm

n_1 = initial number of moles of gas = 1.40 moles

n_2 = final number of moles of gas = ?

Now put all the given values in the above expression, we get:

\frac{24.5atm}{5.30atm}=\frac{1.40mol}{n_2}

n_2=0.301mol

Therefore, the final number of moles of gas that withdrawn from the tank to lower the pressure of the gas must be, 0.301 mol.

8 0
3 years ago
Based on the information above, which statement provides evidence that a chemical reaction has occurred?
Vesna [10]

Answer: Atoms that make up reactants rearrange into new products

Explanation:

A chemical reaction is the process of breaking down the chemical bonds of the reacting substances  which are commonly called as reactants and making new bonds to form new substances commonly called as products.

The products will contain the same atoms as there are in the reactants but the bonds will rearrange to form different substances.

Every chemical reaction is accompanied with absorption or release of energy.

3 0
3 years ago
6. (1 point) What is the correct formula for sodium sulfate? *
Deffense [45]
6) Na2 SO4
7)nonmetallic elements
10)mass
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* sorry I didn't know Q. 8/9
4 0
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Which traits are polygenic? Select three options.
Pavel [41]

Answer:

is there an answier choice u have to choose from or no

Explanation:

3 0
2 years ago
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PLEASE HELP!!!! The temperature at which a liquid changes to a solid is called its_____ point. What is the correct answer?
Katyanochek1 [597]
Freezing point

brainliest please
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