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Sunny_sXe [5.5K]

3 years ago

13

Assuming 0.1 M concentrations, arrange the following acid solutions in order of increasing pH. benzoic acid, HC7H5O2, Ka ≡ 6.3 ×

10−5 chlorous acid, HClO2, Ka ≡ 1.1 × 10−2 formic acid, HCHO2, Ka ≡ 1.8 × 10−4 hydrofluoric acid, HF, Ka ≡ 6.8 × 10−4

1 answer:

monitta3 years ago

7 0

Answer:36112.0

Explanation:

ASSUMNOINJHD

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Using the following thermochemical data, what is the change in enthalpy for the following reaction?

slavikrds [6]

Answer:

D. -120.9 kJ

Explanation:

According to Hess's law ,the total enthalpy change for a reaction is the sum of all changes regardless of the stages or the steps of the reaction.

$CaO + 2HCl \rightarrow CaCl_{2} + H_{2}O\ (\Delta H = -186\ kJ)$ ....(1)

$CaO + H_{2}O\rightarrow Ca(OH)_{2}\ (\Delta H = - 65 \ kJ)$

(this reaction should be reversed in order to reach the required reaction )

On reversing the reaction the sign of $\Delta H$ get reversed.

(In this case change sign from '-' to'+'. Hence $\Delta H$ = + 65 kJ)

$CaO + 2HCl \rightarrow CaCl_{2} + H_{2}O\ (\Delta H = - 186\ kJ)$ ....(1)

$Ca(OH)_{2} \rightarrow CaO + H_{2}O\ (\Delta H = + 65 kJ )$ ......(2)

Adding equation (1) and (2)

$Ca(OH)_{2} + 2HCl \rightarrow CaCl_{2} + 2H_{2}O[tex][tex]Delta H = - 186 + 65 = - 121\kJ$

$Delta H = - 121\kJ$ (It is nearly equal to -120.9 kJ)

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If you began a reaction with the following ions in solution, what would be the net ionic equation?

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Answer:

2 PO₄³⁻(aq) + 3 Fe²⁺(aq) ⇒ Fe₃(PO₄)₂

Explanation:

Let's consider the complete ionic equation between the ions present. It includes all the ions and the insoluble compounds (Fe₃(PO₄)₂ is insoluble).

Na⁺(aq) + 2 PO₄³⁻(aq) + 3 Fe²⁺(aq) + NO₃⁻(aq) ⇒ Fe₃(PO₄)₂ + Na⁺(aq) + NO₃⁻(aq)

The net ionic equation includes only the ions that participate in the reaction (not spectator ions) and the insoluble compounds.

2 PO₄³⁻(aq) + 3 Fe²⁺(aq) ⇒ Fe₃(PO₄)₂

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Processes in which matter changes between liquid and solid states are freezing and melting. Processes in which matter changes between liquid and gaseous states are vaporization, evaporation, and condensation. Processes in which matter changes between solid and gaseous states are sublimation and deposition.

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In this question we are asked to round off the figure 0.02056 to three significant figures.

We are given with four options to chose best out of four

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There are four significant rules, we should keep in mind during round off:

Non-zero digits are so significant

Zeros between two non-zero digits are significant

Leading zeros are not significant

Trailing zeros are important only if the number contains a decimal point

To know more about Round off:

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