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4 years ago

Which of these best describes a scientific model?

Chemistry

1 answer:

goblinko [34]4 years ago

3 0

The answer a way of explaining a complex concept.

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What is the percent yield of NH3 if the reaction of 26.3 g of H2 produces 79.0 g of NH3?

Anvisha [2.4K]

Answer:

$\boxed{\text{53.3 \%}}$

Explanation:

MM: 2.016 17.03

N₂ + 3H₂ ⟶ 2NH3

m/g: 26.3

1. Theoretical yield

(a) Moles of H₂

$\text{Moles of H${_2}$} = \text{26.3 g H${_2}$} \times \dfrac{\text{1 mol H${_2}$}}{\text{2.016 g H${_2}$}} = \text{13.05 mol H${_2}$}$

(b) Moles of NH₃

$\text{Moles of NH${_3}$} = \text{13.05 mol H${_2}$} \times \dfrac{\text{2 mol NH${_3}$}}{\text{3 mol H${_2}$}} = \text{8.697 mol NH${_3}$}$

(c) Theoretical yield of NH₃

$\text{Mass of NH${_3}$} = \text{8.967 mol NH${_3}$} \times \dfrac{\text{17.03 g NH${_3}$}}{\text{1 mol NH${_3}$}} = \text{148.1 g NH${_3}$}$

(d) Percent yield

$\text{Percent yield} = \dfrac{\text{ actual yield}}{\text{ theoretical yield}} \times 100 \% = \dfrac{\text{79.0 g}}{\text{148.1 g}} \times 100 \% = \textbf{53.3 \%}\\\\\text{The percent yield is }\boxed{\textbf{53.3 \%}}$

7 0

3 years ago

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Name a non metal which conducts electricity

Nuetrik [128]

Answer:

Graphite

Graphite is a non-metal and it is the only non-metal that can conduct electricity.

8 0

2 years ago

4. Which statement is true about alkali metals?

Svet_ta [14]

I think its most likely to be A,

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4 years ago

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What is the apparent charge on the chlorine atom in the molecule hcl?

wariber [46]

I believe Cl (chlorine) would have a -1 charge since H tends to have a +1 charge.

Hope this helps!!! :)

7 0

3 years ago

If a rock is thrown 0.8 meters into the air, How fast was it thrown

sergiy2304 [10]

V=0 m/s, u=?, a = 9.8 m/s² and s = 0.8 m
u²=2×9.8×0.8=15.68
<span>u=3.959 ≈ 3.96 m/s

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3 0

3 years ago

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