All categories

3 years ago

I’m stuck with this question need help

Chemistry

1 answer:

Veseljchak [2.6K]3 years ago

8 0

The coefficients are .... 1_ + 3_ --> 3_ + 2_

Hope this helps.

You might be interested in

Lavoisier's discovery that air was not a substance but rather a mixture of nitrogen and oxygen is described as history-making. w

Taya2010 [7]

Antoine Lavoisier was part of a wealthy family in Paris. He pursued to study science upon realizing that chemistry or the study of the elements was not a well-studied field. His discovery of that air was a mixture of nitrogen and oxygen gave rise to the concept of COMBUSTION after repeating the experiments made by Priestly using mercury and other metal oxides.

The event was such a history-making because it disproved that concept that air was a pure substance along with 3 others: earth, fire, and water.

6 0

3 years ago

One way to determine the pH of a solution is to measure the concentration of the acid and base forms of the indicator colorimetr

ki77a [65]

Answer:

pH = 4.26

Explanation:

Bromocresol green is a commonly used pH indicator. The concentration ratio of the acid form to base form explains its color, which reflects the pH of the medium.

C₂₁H₁₄Br₄O₅S + H₂O ⇄ C₂₁H₁₃Br₄O₅S⁻ + H₃O⁺

acid conjugate base

We can calculate the pH through Henderson-Hasselbalch's equation:

$pH=pKa+log(\frac{[base]}{[acid]} )=4.66+log(\frac{1}{2.49} )=4.26$

7 0

3 years ago

Calculate the standard molar enthalpy of formation, in kJ/mol, of NO(g) from the following data:

Paraphin [41]

The above question is incomplete, here is the complete question:

Calculate the standard molar enthalpy of formation of NO(g) from the following data at 298 K:

$N_2(g) + 2O_2 \rightarrow 2NO_2(g), \Delta H^o = 66.4 kJ$

$2NO(g) + O_2\rightarrow 2NO_2(g),\Delta H^o= -114.1 kJ$

Answer:

The standard molar enthalpy of formation of NO is 90.25 kJ/mol.

Explanation:

$N_2(g) + 2O_2 \rightarrow 2NO_2(g), \Delta H^o_{1} = 66.4 kJ$

$2NO(g) + O_2\rightarrow 2NO_2(g),\Delta H^o_{2} = -114.1 kJ$

To calculate the standard molar enthalpy of formation

$N_2+O_2\rightarrow 2NO(g),\Delta H^o_{3} = ?$ ...[3]

Using Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.

[1] - [2] = [3]

$N_2+O_2\rightarrow 2NO(g),\Delta H^o_{3} = ?$

$\Delta H^o_{3} =\Delta H^o_{1} - \Delta H^o_{2}$

$\Delta H^o_{3}=66.4 kJ - [ -114.1 kJ] = 180.5 kJ$

According to reaction [3], 1 mole of nitrogen gas and 1 mole of oxygen gas gives 2 mole of nitrogen monoxide, So, the standard molar enthalpy of formation of 1 mole of NO gas :

= $\frac{\Delta H^o_{3}}{2 mol}$

$=\frac{180.5 kJ}{2 mol}=90.25 kJ/mol$

3 0

3 years ago

carbon disulfide is formed by the reaction of coke (carbon) with sulfur dioxide. how many moles of cs2 will be generated if 8.0

DerKrebs [107]

The balanced chemical reaction:

<span>5C + 2SO2 → CS2 + 4CO
</span>
We are given the amount of coke to be used for the reaction. This will be the starting point for the calculations.

8 mol C ( 1 mol CS2 / 5 mol C ) = 1.6 mol CS2

5 0

3 years ago

Given the pH of 7. Explain how many hydroxide ions (-OH) and hydronium ions (H30+) are present in the solution.

irga5000 [103]

If the pH is 7, the solution is neutral, which means that it is an equal amount of acid and base.

6 0

3 years ago