Given the following reactionsFe2O3 (s) + 3CO (s) → 2Fe (s) + 3CO2 (g)ΔH = -28.0 kJ 3Fe (s) + 4CO2(s) → 4CO (g) + Fe3O4(s)ΔH = +12.5 kJthe enthalpy of the reaction of Fe2O3 with CO 3Fe2O3 (s) + CO (g) → CO2 (g) + 2Fe3O4 (s)is ________ kJ.

PCl5 has ________ electron domains and a ________ molecular arrangement.

How many grams of potassium bromide are there in 250.0 mL of a 2.50 M aqueous solution of potassium bromide?

A 0.355 M K2SO4 solution can be prepared by ________.

How many equivalent resonance structures can be drawn for the molecule of SO3 without having to violate the octet rule on the sulfur atom?

Based on molecular orbital theory, the bond order of the H—H bond in the H2+ ion is ________.

Of the following, the central atom is sp3d2 hybridized only in ________.

The Lewis structure of PF3 shows that the central phosphorus atom has ________ nonbonding and ________ bonding electron pair(s).

Lead (II) carbonate decomposes to give lead (II) oxide and carbon dioxide: PbCO3 (s) → PbO (s) + CO2 (g) How many grams of lead (II) oxide will be produced by the decomposition of 2.50 g of lead (II) carbonate?

An atom of 13C contains ________ protons.