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vfiekz [6]
3 years ago
11

How many moles are 4.20 x 1025 atoms of Ca?

Chemistry
1 answer:
siniylev [52]3 years ago
8 0

Answer:

4305

Explanation:

please mark this answer as brianliest

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Hunter is copying an angle. His work so far follows. Explain the importance of his next step. Which is drawing A-line through A
forsale [732]

Answer:

its c ma man .

This is the other ray that will make up the angle ∠AYZ and will complete the constructioExplanation:

if your taking the quick check these were my awnsers

1.c

2.b

3.d

4.c

5 .A

for the copying an angle quick check only

6 0
3 years ago
Given the three equations below, what is the heat of reaction for the production of glucose, C6H12O6, as described by this equat
UkoKoshka [18]

Answer:

- 1273.02 kJ.

Explanation:

This problem can be solved using Hess's Law.

Hess's Law states that <em>regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes. This law is a manifestation that enthalpy is a state function.</em>

  • We should modify the given 3 equations to obtain the proposed reaction:

<em>6C(s) + 6H₂(g) + 3O₂(g) → C₆H₁₂O₆(s),</em>

<em></em>

  • We should multiply the first equation by (6) and also multiply its ΔH by (6):

6C(s) + 6O₂(g) → 6CO₂(g), ∆H₁ = (6)(–393.51 kJ) = - 2361.06 kJ,

  • Also, we should multiply the second equation and its ΔH by (6):

6H₂(g) + 3O₂(g) → 6H₂O(l), ∆H₂ = (6)(–285.83 kJ) = - 1714.98 kJ.

  • Finally, we should reverse the first equation and multiply its ΔH by (- 1):

6CO₂(g) + H₂O(l) → C₆H₁₂O₆(s) + 6O₂(g), ∆H₃ = (-1)(–2803.02 kJ) = 2803.02 kJ.

  • By summing the three equations, we cam get the proposed reaction:

<em>6C(s) + 6H₂(g) + 3O₂(g) → C₆H₁₂O₆(s),</em>

<em></em>

  • And to get the heat of reaction for the production of glucose, we can sum the values of the three ∆H:

<em>∆Hrxn = ∆H₁ + ∆H₂ + ∆H₃ =</em> (- 2361.06 kJ) + (- 1714.98 kJ) + (2803.02 kJ) = <em>- 1273.02 kJ.</em>

6 0
3 years ago
Read 2 more answers
How many moles of H atoms are there in 2 moles of CH3CH2CH2CH3?
Advocard [28]

AnSweR: 10

ExplanAtion: My random idiot friend just told me

3 0
3 years ago
Carbon dioxide and water vapor are variable gases because
ehidna [41]

Answer:

Their amount is not consistent at all parts of the atmosphere

Explanation:

Carbon dioxide and water vapor exists as variable gases in the atmosphere because their amount varies from one part to the other.

  • The abundance of variable gases is influenced strongly by activities from the surface.
  • This variability occurs a result of the contribution from from life activities on the  surface.
  • Also, due to properties of the gases, they are not evenly distributed.
  • At certain altitudes, the amount of water vapor can be low.
7 0
3 years ago
What two factors determine a molecule is polar or not
Lesechka [4]
<span>The two factors that determine whether or not a molecule is polar are if the individual bonds are even and the </span>shape<span> of the molecule. If the molecule is perfectly symmetric, the molecule will not be polar even if there are polar bonds present.</span>
6 0
4 years ago
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