Areaction occurs when solid x is placed into solution y. as a result, the temperature of the new solution increases by 3°c. the temperature rises another 2°c when more of solid x is added to the solution. what does this indicate about the effect of adding more solid?
a it increased the number of molecular collisions.
b it decreased the number of molecular collisions.
c it decreased the space between the molecules and lowered the reaction rate.
d it increased the space between the molecules and increased the reaction rate.

A. It increased the number of molecular collisions.

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.