Give an example for each of the following terms: (a) matter, (b) substance, (c) mixture.

Explanation:

Matter is defined as any substance that has some mass and occupies volume.

Anything that we can observe is also matter.

For example, a solid wooden box of mass 15 kg is a matter.

When elements of pure substance that we cannot separate by physical methods until we break its chemical chain is known as a substance.

A substance can be present in solid, liquid, gaseous or plasma state.

For example, diamond, gold, water, salt etc are all pure substances.

A mixture is defined as the substance in which two or more substances are physically mixed together.

A mixture can be homogeneous if it contains uniform composition of solute particles into the solvent.

For example, salt dissolved in water is a homogeneous mixture.

A mixture that contains non-uniform composition of solute particles into the solvent is known as a heterogeneous mixture.

For example, sand in water is a heterogeneous mixture.

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.

its first and third is your answer i did the qustion the fourth isnt right