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Serggg [28]
2 years ago
11

1. What allowed fusion reactions to take place in the early universe?

Chemistry
2 answers:
olasank [31]2 years ago
8 0

Answer:

Nuclear fusion in stars converts hydrogen into helium in all stars

Hunter-Best [27]2 years ago
6 0
Nuclear fusion in stars converts hydrogen into helium in all stars
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Full net ionic equation of nitric acid and solid aluminum hydroxide please
atroni [7]
Is ionic equation . nitric acid + solid aluminium = hydroxide.
4 0
3 years ago
QUESTION IS IN IMAGE
Shalnov [3]

Answer:

i dont know

Explanation:

im doing it 4 the points

6 0
3 years ago
During a laboratory experiment, a 2.36-gram sample of NaHCO3 was thermally decomposed. In this experiment, carbon dioxide and wa
eduard

Answer:

  • 90.7 %

Explanation:

<u>1) Chemical equation (given)</u>

  • 2NaHCO₃ → Na₂CO₃ + H₂CO₃

<u>2) Theoretical yield</u>

<u>a) Convert mass of NaHCO₃ to moles:</u>

  • n = mass in grams / molar mass
  • molar mass = 84.007 g/mol
  • n = 2.36 g / 84.007 g/mol = 0.02809 mol

<u>b) Mole ratio:</u>

  • 2 mol NaHCO₃ : 1 mol H₂CO₃

<u>c) Proportionality:</u>

  • 2 mol NaHCO₃ / mol H₂CO₃ = 0.02809 mol NaHCO₃ / x

       ⇒ x = 0.2809 / 2 mol H₂CO₃ = 0.01405 mol H₂CO₃

<u>3) Actual yield</u>

<u>a) Mass balance</u>: 2.36 g - 1.57 g = 0.79 g

<u>b) Convert 0.79 g of carbonic acid to number of moles</u>:

  • n = mass in grams / molar mass

  • molar mass = 62.03 g/mol

  • n = 0.79 g / 62.03 g/mol = 0.01274 mol

<u>4) Percentage yield, y (%)</u>

  • y (%) = actual yield / theoretical yield × 100

  • y (%) = 0.1274 mol / 0.1405 mol × 100 = 90.68%

The answer must show 3 significant figures, so y(%) = 90.7%.

5 0
2 years ago
Jason ate a granola bar and then went for a run. He ran 1 mile and sweat happily. Jason's body transform chemical energy from th
lozanna [386]
The awnser is A  :)
****************************

4 0
3 years ago
How much potassium nitrate can be dissolved in 100 grams of water at 30°C?
masya89 [10]

Answer: In this case, you can estimate that the solubility of potassium nitrate in water at  

60

∘

C

is equal to about

solubility  

≈

110 g / 100 mL water

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−  

This tells you that a saturated solution of potassium nitrate will hold about  

110 g

of dissolved salt, i.e. of dissociated salt, per  

100 mL

of water at  

60

∘

C

.

3 0
3 years ago
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