Questions: Use the References to access important values if needed for this question. The standard heat of formation for NiCl2(s) is -305 kJ / mol at 298 K. Write the formation equation for NiCl2(s) that goes with this value of ΔH°. Be sure to specify states. Write fractions with a slash, such as 1 / 2 for one half. If a box is not needed leave it blank. + Submit Answer 5 question attempts remaining

$Use the References to access important values if needed for this question. The standard heat of formation for NiCl2(s) is -305 kJ / mol at 298 K. Write the formation equation for NiCl2(s) that goes with this value of ΔH°. Be sure to specify states. Write fractions with a slash, such as 1 / 2 for one half. If a box is not needed leave it blank. + Submit Answer 5 question attempts remaining$

Transcript text: Use the References to access important values if needed for this question. The standard heat of formation for $\mathrm{NiCl}_{2}(\mathrm{~s})$ is $-305 \mathrm{~kJ} / \mathrm{mol}$ at 298 K . Write the formation equation for $\mathrm{NiCl}_{2}(\mathrm{~s})$ that goes with this value of $\Delta \mathrm{H}^{\circ}$. Be sure to specify states. Write fractions with a slash, such as $1 / 2$ for one half. If a box is not needed leave it blank. $\square$ $+$ $\square$ $\square$ $\square$ Submit Answer 5 question attempts remaining

Solution

Solution Steps

Step 1: Understand the Concept of Standard Heat of Formation

The standard heat of formation ($\Delta H_f^\circ$) of a compound is the change in enthalpy when one mole of the compound is formed from its elements in their standard states. For $\mathrm{NiCl}_2(\mathrm{s})$, this means forming solid nickel(II) chloride from solid nickel and gaseous chlorine.

Step 2: Identify the Elements and Their Standard States

The elements involved in the formation of $\mathrm{NiCl}_2(\mathrm{s})$ are nickel (Ni) and chlorine (Cl). The standard state of nickel is solid ($\mathrm{Ni(s)}$), and the standard state of chlorine is diatomic gas ($\mathrm{Cl}_2(\mathrm{g})$).

Step 3: Write the Balanced Formation Equation

The formation equation for $\mathrm{NiCl}_2(\mathrm{s})$ from its elements in their standard states is: \[ \mathrm{Ni(s)} + \mathrm{Cl}_2(\mathrm{g)} \rightarrow \mathrm{NiCl}_2(\mathrm{s)} \]

Step 4: Ensure the Equation Matches the Heat of Formation

The equation should represent the formation of exactly one mole of $\mathrm{NiCl}_2(\mathrm{s})$. The stoichiometry is already correct, as one mole of $\mathrm{NiCl}_2(\mathrm{s})$ is formed from one mole of $\mathrm{Ni(s)}$ and one mole of $\mathrm{Cl}_2(\mathrm{g)}$.

Final Answer

The formation equation for $\mathrm{NiCl}_2(\mathrm{s})$ is: \[ \boxed{\mathrm{Ni(s)} + \mathrm{Cl}_2(\mathrm{g)} \rightarrow \mathrm{NiCl}_2(\mathrm{s)}} \]

Was this solution helpful?

Unhelpful

Helpful

Questions asked by other users

< Previous Next >

Thank you for your feedback.

Copied!