Examine the reaction equation. Mg(OH)2(s) + HCl(aq) →H2O(l) + MgCl2(aq) What coefficients will balance the equation? A) 2, 4, 2, 2 B) 1, 2, 3, 1 C) 1, 1, 1, 1 D) 1, 2, 2, 1

D

Explanation:

Mg(OH)2(s) + HCl(aq) →H2O(l) + MgCl2(aq)

Left Side

Mg = 1

O = 2

H = 3

Cl = 1

Right Side

Mg = 1

O = 1

H = 2

Cl = 2

Mg(OH)2(s) + 2HCl(aq) →2H2O(l) + MgCl2(aq)

Left Side

Mg = 1

O = 2

H = 4

Cl = 2

Right Side

Mg = 1

O = 2

H = 4

Cl = 2

D) 1, 2, 2, 1

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).