Answer:
1. 6.45 L
2. 1.76 x 10²³ molecules
Explanation:
1. Avagadros law states that volume of gas at constant temperature and pressure is directly proportional to the amount / number of moles of that gas
we can use the following equation
v1/n1 = v2/n2
where v1 is volume and n1 is number of moles at first instance
and v2 is volume and n2 is number of moles at second instance
at the first instance - n1 = 0.218 mol
second instance - n2 = 0.218 mol + 0.075 mol = 0.293 mol
substituting the values
4.8 L / 0.218 mol = v2 / 0.293 mol
v2 = 6.45 L
new volume is 6.45 L
2. 1 mol of any substance is made of 6.022 x 10²³ units. These units could be atoms making up elements or molecules making up a compound.
therefore if 1 mol consists of 6.022 x 10²³ molecules
then 0.293 mol consists of - 6.022 x 10²³ molecules/mol x 0.293 mol = 1.76 x 10²³ molecules
therefore there are 1.76 x 10²³ molecules now in the cylinder
