A flexible container at an initial volume of 8.15 L contains 7.51 mol of a gas. More gas is
then added to the container until it reaches a final volume of 13.9 L. Assuming the
pressure and the temperature of the gas remained constant, calculate the moles of gas
added to the container.
15.1 mol
O 5.5 mol
0 4.40 mol
12.8 mol

The answer for the following problem is mentioned below.

Therefore the final moles of the gas is 12.8 molesTherefore the option is "D"  (12.8 moles)

Explanation:

Given:

Initial moles () = 7.51 moles

Initial volume () = 8.15 L

Final volume () = 13.9 L

To find:

Final moles of the gas

We know;

From the ideal gas equation;

P × V = n × R × T

where;

P represents the pressure of the gas

V represents the volume of the gas

n represents the no of moles of the gas

R represents the universal gas constant

T represents the temperature of the gas

we know;

from the above mentioned equation,

   V ∝ n

So,

=

where,

represents the initial volume

represents the final volume

represents the initial moles

represents the final moles

So,

=

= 12.8 moles

Therefore the final moles of the gas is 12.8 moles

The mass has escaped into a gas which you can not see so the law stays true.

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.