Given: Initial volume of
gas= 15.0 L
Pressure=1.50 atm
Temperature=23°C
Use ideal gas equation as follows:

Here, P is pressure, V is volume, n is number of moles, R is Universal gas constant and T is temperature in Kelvin.
First convert the given temperature in Kelvin.
0°C=273.15 K
Thus, 23 °C=296.15 K
Rearranging ideal gas equation to calculate the value of nR as follows:

Now, final pressure is 3.50 atm and temperature is 286°C, converting the temperature into Kelvin,
0°C=273.15 K
Thus, 286 °C=559.15 K
Volume can be calculated using the ideal gas equation as follows:

Putting the value of given pressure and temperature and the above calculated value of nR,

Therefore, volume of
at 3.50 atm and 286°C is 12.14 L.
Answer:
The element of the atom.
Explanation:
The number of protons confirms what element is the atom.
Answer:
the correct answer is c, how easily something catches flames