A sample of hydrogen gas contains 4.8 x 1026 molecules of hydrogen. How many moles of hydrogen is this?

797.34 moles of H₂

Explanation:

From the question given above, the following data were obtained:

Number of molecules of H₂ = 4.8×10²⁶ molecules

Number of mole of H₂ =?

From Avogadro's hypothesis,

1 mole of H₂ = 6.02×10²³ molecules

With the above information, we can determine the number of mole of H₂ that contains 4.8×10²⁶ molecules as follow:

6.02×10²³ molecules = 1 mole of H₂

Therefore,

4.8×10²⁶ molecules = 4.8×10²⁶ / 6.02×10²³

4.8×10²⁶ molecules = 797.34 moles

Thus, 797.34 moles of H₂ contains 4.8×10²⁶ molecules.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

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