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liraira [26]
3 years ago
8

The equilibrium constant Kc for the reaction 2NO(g)+O2(g)⇌2NO2(g) is 6.9×105 at 500 K. A 5.0 L reaction vessel at 500 K was fill

ed with 0.056 mol of NO, 1.0 mol of O2, and 0.90 mol of NO2. Part A What is the value of Qc?
Chemistry
1 answer:
baherus [9]3 years ago
4 0

Answer:

Q = 1291.5

Explanation:

Step 1: Data given

Kc = 6.9 * 10^5 at 500 K

Volume = 5.0 L

Number of moles NO = 0.056 moles

Number of moles O2 = 1.0 moles

Number of moles NO2 = 0.90 moles

Step 2: The balanced equation

2NO(g) + O2(g) ⇌ 2NO2(g)

Step 3: Calculate the concentration

Concentration = moles / volume

[NO] = 0.056 moles / 5.0 L

[NO]= 0.0112 M

[O2] = 1.0 mol / 5.0L

[O2] = 0.2 M

[NO2] = 0.90 moles / 5.0L

[NO2] = 0.18 M

Step 4: Calculate Q

Q = [NO2]²/[NO]²[O2]

Q = [0.18²]/[(0.0112²)(0.2)]

Q = 1291.5

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Explanation:

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A student preforms a chemical reaction in which 35 grams of hydrogen and 65 grams of oxygen reacted to form water. What is the m
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Answer:

Mass of water = 73.08 g

Explanation:

Given data:

Mass of hydrogen = 35 g

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Mass of water = ?

Solution:

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2H₂  + O₂   →    2H₂O

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Now we compare the moles of water with moles hydrogen and oxygen.

                                     H₂               :              H₂O

                                      2                :                2

                                    17.5              :              17.5

                                       O₂             :            H₂O

                                      1                :               2

                                      2.03         :             2× 2.03 =4.06 mol

Number of moles of water produced by oxygen are less so oxygen is limitting reactant.

Mass of water:

           Mass of water = number of moles × molar mass

          Mass of water = 4.06 mol × 18 g/mol

           Mass of water = 73.08 g

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