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ella [17]
3 years ago
10

2nh3(g) → n2(g) + 3h2(g) the reaction for the decomposition of ammonia (nh3) can be written as shown. if a student starts with 2

1.7 g of nh3, how many grams of hydrogen (h2) gas will be produced by the reaction? 1.28 g 32.5 g 2.55 g 3.85 g
Chemistry
2 answers:
xenn [34]3 years ago
8 0

Answer: 3.85 g


Explanation:


1) Balanced chemical equation:


2NH₃(g) → N₂(g) + 3H₂(g)


2) Mole ratios:


2 mol NH₃(g) : 1 mol N₂(g) : 3 mol H₂(g)


3) Convert 21.7 g NH₃ to moles


molar mass of NH₃: 14.007 g/mol + 3×1.008 g/mol = 17.031 g/mol


number of moles = mass in grams / molar mass = 21.7 g / 17.031 g/mol = 1.2741 moles


4) Proportionality


2 moles NH₃ / 3 moles 3H₂ = 1.2741 moles NH₃ / x


⇒ x = 1.2741 × 3 / 2 moles H₂ = 1.911 moles H₂


5) Convert 1.911 moles to grams


molar mass H₂ = 2×1.008 g/mol = 2.016 g/mol


mass in grams = number of moles × molar mass = 1.911 moles × 2.016 g/mol = 3.85 g



spin [16.1K]3 years ago
4 0
3.85 :) .....................................................................

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List in ascending order the different layers of atmosphere, their heights, and main their features. Help please!!! :•)
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Troposphere

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Mesosphere

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Explanation:

These are all listed in ascending order, hope this helps!

6 0
3 years ago
A reaction is started with both reactants and products and proceeds in the reverse direction to reach equilibrium. Which of the
nekit [7.7K]

Answer:

Option A

Explanation:

A) Yes. The reaction reaches equilibrium when the rate of reaction of the reverse reaction is equal to the rate of the forward reaction , then the only cause for the reverse reaction to be favoured is that the initial rate of the reverse was greater than the forward one.

B) No. The rate constant of the reverse reaction can be greater than the forward one  but the rate also depends on concentrations, thus a reverse reaction with greater rate constant can result in the net reaction proceeding in the forward reaction, the reverse reaction or be at equilibrium depending on the concentrations or reactants and products

C) No. A lower activation energy means a higher rate constant , but a higher rate constant does not mean that the net reaction will proceed to the reactants ( see point B)

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6 0
3 years ago
How far apart must two point charges of 75.0 nC (typical of static electricity) be to have a force of 1.00 N between them? (answ
Jet001 [13]

Answer:

7.12 mm

Explanation:

From coulomb's law,

F = kqq'/r².................... Equation 1

Where F = force, k = proportionality constant, q and q' = The two point charges, r = distance between the two charges.

Make r the subject of the equation,

r = √(kqq'/F).......................... Equation 2

Given: q = q' = 75.0 nC = 75×10⁻⁹ C, F = 1.00 N

Constant: k = 9.0×10⁹ Nm²/C².

Substitute into equation 2

r = √[ (75×10⁻⁹ )²9.0×10⁹/1]

r = 75×10⁻⁹.√(9.0×10⁹)

r = (75×10⁻⁹)(9.49×10⁴)

r = 711.75×10⁻⁵

r = 7.12×10⁻³ m

r = 7.12 mm

Hence the distance between the point charge = 7.12 mm

3 0
3 years ago
Magnesium has three naturally occurring isotopes with masses of 23.99 amu, 24.99 amu, and 25.98 amu and natural abundances of 78
mihalych1998 [28]

Answer:24.31

Explanation:Contribution made by isotope of mass 23.99= 23.99×78.99=1894.97

Contribution made by isotope of mass 24.99=24.99×10.00=249.9

Contribution made by isotope of mass 25.98=25.98×11.01=286.04

Total contribution=1894.97+249.9+286.04=2430.91

Average mass=2430.91÷100

=24.31

3 0
3 years ago
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