31 gof phosphorousreacted with oxygengas to form 71 gof a phosphorousoxide. what is the empirical formulaof the oxide

In this problem you would need to determine the mass of each element first. The mass of phosphorus is given which is 31 grams. The mass of oxygen is the difference between 71 grams and 31 since we know that the compound formed weighs 71 grams. Then determine the moles of each element. You would get 1.0009 moles for phosphorus and 2.5 moles for oxygen. You have to then multiply the moles to the lowest number that would give a whole number for each element. The empirical formula of the oxide is P2O5. 

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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explanation:

because it is