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Standard XII

Chemistry

Ideal Gas Equation

Of the statem...

Question

Of the statements below, which best explains why $C H_{4}$ is a gas at STP. while $C_{8} H_{18}$ is a liquid and $C_{20} H_{42}$ is solid?

C_{20} H_{42}

has the greatest ionic interaction between its molecules

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C_{20} H_{23}

has a greater amount of hydrogen bonding than CH. or Celia

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Here is a more dipole-dipole interaction between molecules of greater mass

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C H_{4}

has the greatest intermolecular forces while

C_{20} H_{42}

has the least

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There are more Van der Weals (dispersion) forces between nonpolar molecules that are greater in mass

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Solution

The correct option is E There are more Van der Weals (dispersion) forces between nonpolar molecules that are greater in mass
As the molecule size gets larger, there is more vander waal's force, so they have more attraction between them $C H_{4}$ is small. This the attraction force is small and it is a gas at STP. $C_{8} H 18$ have higher molecular size and the force of attraction than mehane molecular. So, it is liquid and $C_{20} H_{40}$ is larger than $C_{8} H_{18}$ Hence, the vander waal force of attraction is higher than the other two.

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Of the statements below, which best explains why CH4 is a gas at STP. while C8H18 is a liquid and C20H42 is solid?

Of the statements below, which best explains why $C H_{4}$ is a gas at STP. while $C_{8} H_{18}$ is a liquid and $C_{20} H_{42}$ is solid?