Question

Which equations contain all products and reactants with the correct state under standard conditions?

A. 2 K(s) + Cl2 (g) → 2 KCl(s)
B. 2 C6H14(l) + 19 O2(g) → 12 CO2(g) + 14 H2O(l)
C. CO(g) + Br2(l ) → COBr2 (l )
D. P4(s) + 6 H2(g) → 4 PH3(g)
E. none of the above

Answer 1

Each of the options A, B, C, and D correctly represents the standard states of matter for the respective reactants and products in the given chemical equations.

Step-by-step explanation:

The question asks which of the given equations contains all products and reactants with the correct state under standard conditions. Checking each option:

• A. 2 K(s) + Cl2 (g) → 2 KCl(s) - This equation shows the correct states for potassium (solid), chlorine gas, and potassium chloride (solid) under standard conditions.
• B. 2 C6H14(l) + 19 O2(g) → 12 CO2(g) + 14 H2O(l) - Hexane (C6H14) is a liquid, oxygen is a gas, carbon dioxide is a gas, and water is a liquid under standard conditions; thus, this option is also correct.
• C. CO(g) + Br2(l) → COBr2 (l) - Carbon monoxide is a gas and bromine is a liquid at standard conditions, which is correctly represented here.
• D. P4(s) + 6 H2(g) → 4 PH3(g) - Phosphorus exists as a solid and hydrogen as a gas under standard conditions, which is accurately displayed in this equation.

All options A, B, C, and D show the correct states of matter for the chemicals involved under standard conditions.