A sample of helium has a volume of 3.49 L at 741 mmHg. What would be the volume if the pressure were changed to 760 mmHg at the same temperature?

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Explanation:

From the word equation, you can write the molecular equation, and the balanced molecular equation, which is a basic skill that chemistry studends must develop.

1. Write the chemical formula of each reactant and product

a) Chlorine: Cl₂ (g) . It is a diatomic gas at room temperature and standard pressue.

b) Potassium nitride is a salt formed by N₃⁻ ion and K⁺ ion. It is a solid at room temperature.

c) Nitrogen: N₂(g). It is a diatomic gas at room temperature and standard pressure

d) Potassium chloride: it is the salt with the ions K⁺ and Cl⁻. It is also a solid at room temperature.

2. Write the molecular chemical equation:

3. Balance the molecular equation:

Add the needed coefficients to balance both sides of the equation:

Count the number of each kind of atom on each side:

Then, the equation is balanced.