Answer this. (a) which two conditions must be fulfilled by balanced ionic equations? select all that apply
number of atoms of each kind must be the same on both sides of the arrow.
electrical charge must be balanced.
the number of reactants must equal the number of products.
the sum of coefficients for reactants and products must be equal

Explanation:

The first two answers are the correct ones. Sometimes C can be true, but it is not a condition. Some equations produce many more products than reactants and some equations are made from more reactants than products.

The last one is normally not true, but the three equations I choose below do give D to be true. Still it does not happen all the time.

C8H18 + 12.5 O2  ===> 8CO2  + 9H20    This is the combustion equation that drives your engine. The coefficients do not add.

Same number of reactants as products.

CH4 + 2O2 ==> CO2 + 2H2O

More products than reactants.

Cu + 4HNO3 ==> Cu(NO3)2 + 2NO2 + 2H2O

More Reactants than products.

H2 + I2 ==> 2HI

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.