Q1: Volume percent for gases is equal to the

ANS:D - mole percent only for ideal gases.

Volume percent for gases is equal to the mole percent. Volume percent is a measure of the concentration of a gas in a mixture and is defined as the volume of the gas divided by the total volume of the mixture, multiplied by 100. Similarly, mole percent is a measure of the concentration of a gas in a mixture but is expressed in terms of moles instead of volume. It is defined as the number of moles of the gas divided by the total number of moles of all components in the mixture, multiplied by 100. Weight percent, on the other hand, is a measure of the concentration of a substance in a mixture based on the mass of the substance relative to the total mass of the mixture. While volume percent and mole percent are suitable measures for gases in mixtures regardless of whether they behave ideally or not, weight percent may not be as straightforward for gases, especially when dealing with non-ideal behavior due to differences in molar masses. Therefore, weight percent is not equivalent to volume percent for gases. Similarly, weight percent is not equivalent to mole percent for gases, especially in non-ideal conditions where the molar masses of gases differ. Hence, the correct statement is: Volume percent for gases is equal to the mole percent.