What mass of magnesium oxide is produced when 60g of magnesium is burnt in air?

The chemical equation can be written as:

2Mg+O

2

→2MgO

48 g of Mg reacts with 32 g of O

2

.

Thus, 4.8 g of Mg reacts with 3.2 g of O

2

.

Now, 32 g of O

2

forms = 80 g of MgO.

3.2 g of O

2

produces =

32

80

×3.2 = 8 g of MgO.

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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.