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Anestetic [448]
3 years ago
13

If a laser operating at a wavelength of 488 nm and a power of 123.0 mW is turned on for 18.73 minutes, how many photons has it e

mitted?
Chemistry
1 answer:
Verizon [17]3 years ago
7 0

Answer:

3.39e+20

Explanation:

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The combustion of heptane (C7H16) in oxygen spontaneously occurs. The products of the reaction are carbon dioxide and water vapor. The balanced chemical equation is 7H16 + 11O2 → 7CO2 + 8H2O H = –2877.5 kJ.

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Which of these solutes raises the boiling point of water the most?
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Raising of the boiling point is a colligative property. That means that it depends on the number of particles dissolved. The greater the number of particles the greater the increase in the boiling point. So, you can compare the effect of these solutes in the increase of the boiling point by writing the chemical equations and comparing the number of particles dissolved: 1)ionic lithium chloride, LiCl(s) --> Li(+) + Cl (-) => 2 ions; 2) ionic sodium chloride, NaCl(s) --> Na(+) + Cl(-) => 2 ions; 3) molecular sucrose, C12H22O11 (s) ---> C12H22O11(aq) => 1 molecule; 4) ionic phosphate, Na3PO4 --> 3Na(+) + PO4 (3-) => 4 ions; 5) ionic magnesium bromide, MgBr2 --> Mg(2+) + 2 Br(-) => 3 ions. <span>So, ionic phosphate produces the greatest number of particles and it will cause the greatest increase of the boiling point.</span><span />
4 0
3 years ago
Why is the brcl molecules polar??
tester [92]
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5 0
3 years ago
Read 2 more answers
Which one of the samples contains the most molecules?
Alex

Answer: D is right

Explanation: One mole contains 6.0225 ·10^23 molecules

Despite of the substance

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3 years ago
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