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hjlf
3 years ago
13

Ammonia (NH3) can be produced by the reaction of hydrogen gas with nitrogen gas:

Chemistry
2 answers:
sp2606 [1]3 years ago
3 0
B) 40%  
The balanced equation indicates that for every 3 moles of H2 used, 2 moles of NH3 will be produced. So the reaction if it had 100% yield would produce (2.00 / 3) * 2 = 1.333333333 moles of NH3. But only 0.54 moles were produced. So the percent yield is 0.54 / 1.3333 = 0.405 = 40.5%. This is a close enough match to option "b" to be considered correct.
Aleksandr-060686 [28]3 years ago
3 0

Answer: The correct option is b.

Explanation: To calculate the percentage yield, we use the formula:

\%\text{ yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100   ....(1)

For a given reaction:

3H_2+N_2\rightarrow 2NH_3

  • Experimental yield calculations:

0.54 moles of ammonia is formed.

So, amount of ammonia formed will be calculated using the formula:

Moles=\frac{\text{given mass}}{\text{Molar mass}}      ....(2)

Molar mass of NH_3 = 17.031g/mol

0.54=\frac{\text{given mass}}{17.031}

Amount of NH_3 = 9.197g

Experimental yield : 9.197 g

  • Theoretical yield calculations:

By Stoichiometry of the reaction,

Here, limiting reagent is hydrogen gas because it limits the formation of product.

3 moles of hydrogen gas is producing 2 moles of ammonia

So, 2 moles of hydrogen gas will produce = \frac{2}{3}\times 2=1.33 moles of ammonia.

Amount of ammonia is calculated by using equation 2, we get:

1.33moles=\frac{\text{Given mass}}{17.031g/mol}

Theoretical yield of ammonia  =22.65 grams

Now, putting values in equation 1, we get:

\%\text{ yield}=\frac{9.197}{22.65}\times 100

% yield=40.60 %

Hence, the correct option is b.

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Alex777 [14]

Answer:

option "B" is correct (substance 2)

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3 years ago
The sun has been up for several hours, and it has been shining on these trees. What can the trees do because they are in sunligh
Nonamiya [84]

Answer:

1. C. take in carbon from the air. The carbon is used to make energy storage

molecules.

2. b Carbon is moving into the air and out of the air at the same time

Explanation:

Question 1:

Trees are plants, which are autotrophic organisms i.e. set of organisms that are capable of producing their own food via a process called PHOTOSYNTHESIS. This photosynthetic process produces sugars (glucose) in the presence of SUNLIGHT. According to this question, the sun has been up for several hours, and has been shining on these trees. This means that the trees can take in carbo dioxide (CO2) in order to perform the process of photosynthesis. Also, the number of energy storage molecules in the trees (ATP) will INCREASE.

What can the trees do because they are in sunlight? What does this mean for the ?

8 0
3 years ago
25.0 mL of nitrous acid (HNO2) is titrated with a 1.235 M solution of KOH. The equivalence point (stoichiometric point) is obser
tatuchka [14]

Answer:

0.456 M

Explanation:

Step 1: Write the balanced neutralization equation

HNO₂ + KOH ⇒ KNO₂ + H₂O

Step 2: Calculate the reacting moles of KOH

9.26 mL of 1.235 M KOH react.

0.00926 L × 1.235 mol/L = 0.0114 mol

Step 3: Calculate the reacting moles of HNO₂

The molar ratio of HNO₂ to KOH is 1:1. The reacting moles of HNO₂ are 1/1 × 0.0114 mol = 0.0114 mol.

Step 4: Calculate the initial concentration of HNO₂

0.0114 moles of HNO₂ are in 25.0 mL of solution.

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3 0
3 years ago
What is the mass of 0.100 mole of neon? (Watch sf’s) 2.018 g 20.18 g 2.02 g 2 g
makkiz [27]

Answer:

The mass of 0.100 mole of neon is 2.018 grams.

Explanation:

As we know the formula to find mass:

                           Number of moles         =  Mass/ Molar mass

                                        0.100                = Mass/ 20.17

                                        0.100 x 20.17   = Mass

                                                        Mass=2.018 grams.

Hope it helps!

7 0
2 years ago
Explain step by step, please!
konstantin123 [22]

Answer:

10. Stacey

11. 7.86 g/cm^3 (3dp)

OR 786 kg/m^3 (SI units)

Explanation:

10. The correct exact answer for 10 is 26.169 (6.71x3.9). While Sam was correct in the precision of the number (2dp just like the given measurements), he was incorrect in the number itself. While Stacy's number was not as precise as Sam's (0dp), it is correctly rounded to the nearest whole number, therefore Stacy is correct.

11. The formula for density is mass/volume. The mass here is 264g and the volume is 33.6ml, therefore the density is 7.86 (3 sig figs because given values had 3) g/cm^3, because the mass was given in grams and 1ml = 1cm^3. Converted to SI units it is 786 kg/m^3.

Hope this helped!

4 0
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