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loris [4]
2 years ago
13

How many grams of nitrogen will be produced in a reaction between ammonia and dinitrogen monoxide in which the total heat energy

released was 505 KJ?
2 NH3 + 3 N2O = 4 N2 + 3 H2O DELTA Hrxn= ?
Given:
4 NH3 + 3 O2 = 2 N2 + 6 H2O DELTA Hrxn= -1556KJ
N2O + H2 = N2 + H2O DELTA Hrxn= -389.4 KJ
H2+ ½ O2 = H2O DELTA Hrxn= -223.9 KJ
Chemistry
1 answer:
tensa zangetsu [6.8K]2 years ago
3 0

Answer:

55.5g of N₂

Explanation:

It is possible to find ΔH of a reaction by the sum of half-reaction (Hess's law), thus:

<em>(1) </em>4 NH₃ + 3 O₂ → 2 N₂ + 6 H₂O ΔH= -1556KJ

<em>(2) </em>N₂O + H₂ → N₂ + H₂O  ΔH= -389.4 KJ

<em>(3) </em>H₂+ ½ O₂ → H₂O  ΔH= -223.9 KJ

(4) = 1/2 (1) + 3 (2):

<em>(4) </em>2 NH₃ + 3 N₂O +3 H₂ + ³/₂ O₂ → 4 N₂ + 6 H₂O

ΔH = 1/2 (-1556kJ) + 3 (-389.4kJ) = -1946.2kJ

(4) - 3(3):

2 NH₃ + 3 N₂O → 4 N₂ + 3 H₂O ΔH = -1946.2kJ - 3 (-223.9 KJ)

ΔH = -1274.5 kJ

As when 5 moles of nitrogen are produced there are released 1274.5kJ, when are released 505kJ:

505kJ × (5 moles N₂ / 1274.5kJ) =<em> 1.98 moles of N₂. </em>In mass:

1.98moles N₂ ₓ (28g / 1mol) = <em>55.5g of N₂</em>

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3 years ago
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Nadya [2.5K]

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3 0
2 years ago
How many grams of Na2SO4 can be produced from 423.67 g of NaCl?
san4es73 [151]

Mass of  Na2SO4= 514.18 grams

<h3>Further explanation</h3>

Given

423.67 g of NaCl

Required

mass of  Na2SO4

Solution

Reaction

2NaCl + H2SO4 → Na2SO4 + 2HCl

mol NaCl :

= 423.67 g : 58.5 g/mol

= 7.24

From the equation, mol Na2SO4 :

= 1/2 x mol NaCl

= 1/2 x 7.24

= 3.62

Mass  Na2SO4 :

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4 0
2 years ago
According to the phase diagram for H₂O, what happens to the phases of
sergejj [24]

Answer:

"A", "water changes from a gas to a solid to a liquid", according to this phase diagram, at at 0°C, as pressure is increased from 0atm to 10atm.

Explanation:

The question asks what happens at 0°C, as pressure is increased from 0atm to 10atm.

According to the question, the temperature is held constant.  The pressure changes.  In the phase diagram, we find the temperature 0°C on the horizontal axis, and all points where the temperature are 0°C are along that vertical line.

Since the pressure starts at 0atm and increases to 10atm, we start at the bottom, and move upward along that line, to see what phases of matter the substance changes to.

At the bottom, it is initially in a "gas" phase.  As it moves up, it transitions to a "solid" phase.  Later, as it continues moving up, it changes again into a "liquid" phase.

Thus, the answer would be "A", "water changes from a gas to a solid to a liquid", according to this phase diagram, at at 0°C, as pressure is increased from 0atm to 10atm.

8 0
1 year ago
A bumblebee flies with a ground speed of 15.0 m/s . Calculate its speed in km/h.
zheka24 [161]
Speed in km/hr = 15 x 18
                            ------------
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                          =   54 km/hr.

Hope this helps!

5 0
3 years ago
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