Answer: 2Cr + 3Br2 Yields 3CrBr3
Explanation:
We know that 4a is not balanced because there are 3 Nitrogen atoms on the reactants side and 2 on the products side.
We know that 4c is not balanced because there are 4 Chlorine atoms on the reactants side and 2 on the products side. (Remember there are 2 Cl2 atoms. Therefore, 2 times 2 means there are 4 Chlorine atoms on the reactants side)
Finally, we know the answer is not 4d because there is 1 Potassium on the reactants side and 2 potassiums on the products side.
Therefore, the answer must be 4b, which contains 2 Chromium atoms and 6 bromine atoms on each side
Answer:
The correct answer is A
We'll have 2.0 moles of magnesium nitride produced and and excess of 2.0 moles nitrogen gas
Explanation:
Step 1: Data given
Number of moles nitrogen gas (N2) = 4.0 moles
Number of moles magnesium = 6.0 moles
Step 2: The balanced equation
3Mg + N2 → Mg3N2
Step 3: Calculate the limiting reactant
For 3 molesmagnesium (Mg) we need 1 mol nitrogen gas (N2) to react, to produce 1 mol magnesium nitride (Mg3N2)
Magnesium is the limiting reactant. It will completely be consumed 6.0 moles. Nitrogen is in excess. There will react 6.0 / 3 = 2.0 moles
There will remain 4.0 - 2.0 = 2.0 moles N2
Step4: Calculate moles Mg3N2
For 3 molesmagnesium (Mg) we need 1 mol nitrogen gas (N2) to react, to produce 1 mol magnesium nitride (Mg3N2)
For 6.0 moles Mg we'll have 6.0 / 3 = 2.0 moles Mg3N2
The correct answer is A
We'll have 2.0 moles of magnesium nitride produced and and excess of 2.0 moles nitrogen gas
Answer:
-514 kJ/mol
Explanation:
The bond enthalpy which is also known as bond energy can be defined as the amount of energy needed to split one mole of the stated bond. The change in enthalpy of a given reaction can be estimated by subtracting the sum of the bond energies of the reactants from the sum of the bond energies of the products.
For the given chemical reaction, the change in enthalpy of the reaction is:
Δ [2(409) + 4(388) + 3(496) - 4(630) - 4(463)] kJ/mol = 818 + 1552 + 1488 - 2520 - 1852 = -514 kJ/mol
The answer is D. <span>619 :D</span>