How many grams of aluminum are in 25.0 g of aluminum oxide?

Explanation:

First we have to find the molar mass of the compound.

We must multiply the atomic mass of each element of the compound by the number of atoms of each one

Aluminum oxide:

molar mass

We know that in 1 mol of it has a mass of 101.96g.

Now we can find out how many moles of are in 25 g.

For every mole of we have 2 moles of Al.

To find out how many moles of Al we have in we use a rule of three

There are 0.49 moles of Al in 25 g of

now we calculate the grams of Al in 0.49 moles of Al

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.

nuhygjhuhuouh9oygyuhuh8h9guig97uogh8uog978o0rfyhkmkv h