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SashulF [63]
3 years ago
6

Water and methane have similar molar masses. methane changes from liquid to a gas. what could account for the difference

Chemistry
1 answer:
TEA [102]3 years ago
5 0
Water contains more electronegative oxygen. Hydrogens bonded directly to oxygen atoms gets partial positive charge which means the electron density on hydrogen atoms has decreased and a partial negative charge forms on oxygen atom. This partial negative charge on oxygen and partial positive charge on hydrogen attracts each other and forms intermolecular force called Hydrogen Bonding.

                                        H₂O ------ H₂O ------- H₂O

The dashed line show hydrogen bonding.

In case methane hydrogen atoms are bonded to Carbon atoms and there is very small electronegativity difference between them, hence, fails to form partial positive and partial negative charge, hence, no hydrogen bonding. Such non polar compounds obtain special type of intermolecular interactions called London-Dispersion Forces which are weaker compared to Hydrogen bond interactions.

Result:
           
Water exist as liquid due to strong Hydrogen bonding between water molecules, while, methane lacks such interactions.
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Explanation:

The best statement that describes the collision of gas particles according to the kinetic-molecular theory is that as particles travel in straight lines, their paths sometimes meet and then they bounce apart with no gain or loss of energy.

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What volume would a 0. 250 mole sample of h2 gas occupy if it had a which a a pressure of 1. 70 atm and a temperature of 35 C?
frosja888 [35]

The volume of  0. 250 mole sample of H_{2} gas occupy if it had a pressure of 1. 70 atm and a temperature of 35 °C is  3.71 L.

Calculation,

According to ideal gas equation which is known as ideal gas law,

PV =n RT

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  • Vis the volume of the hydrogen gas = ?
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  • R is the universal gas constant = 0.082 atm L/mole K
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By putting all the values of the given data like pressure temperature universal gas constant and number of moles in equation (i) we get ,

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