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3 years ago

How many moles of nitrogen, N, are in 78.0g of nitrous oxide, N2O?

Chemistry

1 answer:

DaniilM [7]3 years ago

8 0

I hope this helps you!

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4). One mole of monoclinic sulfur at 25C was placed in a constant-pressure calorimeter whose heat capacity (C) was 1620 J/K. T

andre [41]

Answer: The enthalpy change of the reaction is -243 J/mol

Explanation:

The heat released by the reaction is absorbed by the calorimeter and the solution.

The chemical equation used to calculate the heat released follows:

$q=c\times \Delta T$

where,

c = heat capacity of calorimeter = 1620 J/K

$\Delta T$ = change in temperature = $0.150^oC=0.150K$ (Change remains same)

Putting values in above equation, we get:

$q=1620J/K\times 0.15K=243J$

Sign convention of heat:

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

For the given chemical reaction:

$S\text{ (monoclinic)}\rightarrow S\text{ (orthorhombic)}$

We are given:

Moles of monoclinic sulfur = 1 mole

To calculate the enthalpy change of the reaction, we use the equation:

$\Delta H_{rxn}=\frac{q}{n}$

where,

q = amount of heat released = -243 J

n = number of moles = 1 mole

$\Delta H_{rxn}$ = enthalpy change of the reaction

Putting values in above equation, we get:

$\Delta H_{rxn}=\frac{-243J}{1mol}=-243J/mol$

Hence, the enthalpy change of the reaction is -243 J/mol

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3 years ago

Що таке кислоти? pliz

Shtirlitz [24]

Answer:

The last word means acid.

Explanation:

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2 years ago

Write the symbol for element x which has 22 electrons and 22 neutrons

marissa [1.9K]

Titanium has 22 protons and electrons. The symbol for Titanium is (Ti).

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2 years ago

Photosynthesis uses all of the following except __ to make food ?

Harman [31]

What are the options

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2 years ago

At the end of the reaction you washed the chemicals into a beaker using water. Why was it OK to use water to do this if Grignard

lesya692 [45]

Answer: water could be used to wash it since the reaction has ended.

Explanation:

There will be no reaction of water with the Grignard reagent since the reaction has ended, as it is well known that water is a universal solvent for washing of glasswares after experiments but if it is during the reaction it will be more advisable to rinse with alcohol to enhance more accuracy during the experiment

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3 years ago