A2.5-liter sample of a gas at 2.0 atm and 300.0 k has 0.30 mole of the gas. if 0.15 mole of the gas is added to the sample at the same temperature and pressure, what is the final volume of the gas? 3.4 liters 3.8 liters 4.2 liters 4.7 liters

3.8 liters

Explanation:

According to Avogadro’s Law  of gases

at constant temperature and pressure, the volume of all gases constitutes an equal number of molecules. In other words, the volume of any gas is directly proportional to the number of molecules of that gas.

∴ V ∝ n   or (V₁/V₂) = (n₁/n₂)

V₁= 2.5 L

n₁= 0.3 mol

n₂= 0.3 mol + 0.15 mol = 0.45 mol

using cross multiplication

(2.5 L / V₂) = (0.3 mol / 0.45 mol)

V₂= 3.8 L

∴ The right choice is 3.8 liters

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error