Which four quantities a, b, c and d are required to balance the equation ... aFe2O3(s) + bHCl(aq) ==> FeCl3(aq) + dH2O(1) ?

Fe2O3 + 6HCl ==> 2FeCl3 + 3H2O

=> a = 1

b = 6

c = 2

d = 3

the correct answer is answer a. a mixture

no other options make sense

hope this

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  - sprinkles

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.