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ehidna [41]
3 years ago
7

Helium (He) and neon (Ne) are elements in Group 8A of the periodic table. How do the electron dot diagrams of these elements com

pare?
The electron dot diagram of helium has six fewer dots than the electron dot diagram of neon.
The electron dot diagram of helium has eight fewer dots than the electron dot diagram of neon.
Both the electron dot diagram of helium and the electron dot diagram of neon have two dots.
Both the electron dot diagram of helium and the electron dot diagram of neon have eight dots.
Chemistry
2 answers:
Elena L [17]3 years ago
6 0

Answer:

The electron dot diagram of helium has six fewer dots than the electron dot diagram of neon.

Explanation:

rosijanka [135]3 years ago
6 0

Answer:

Answer:

The electron dot diagram of helium has six fewer dots than the electron dot diagram of neon.

Explanation:

Explanation:

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1 C3H8 + 5 O2 --> 3 CO2 + 4H20. If 1.5 moles of C3H8 react, how many
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Answer:

First confirm the reaction is balanced:

C3H8 + 5O2 --> 3CO2 + 4H20 (3 cabon - check; 8 hydrogen - check; 10 oxygen - check).

a) In the equation there is a 5:1 ratio between propane and oxygen.  We also know that number of mole is proportional to pressure and volume.  Since pressure is constant (STP) then the volume of O2 is 7.2 * 5 = 36 litres.

b) For a near ideal gas that PV = nRT (combined gas law).  So for 7.2 litres propane we find n(propane) = 101.3 * 7.2/8.314*298 ~ 0.29 mole (using metric units throughout for simplicity).

There is a 1:3 ratio between propane and CO2.  Therefore 3 * 0.29 = 0.87 mole of CO2 is produced.

MW(CO2) ~ 44 g/mol.  Therefore m(CO2) = 44 * 0.87 ~ 38.3 g

c) We know we need more oxygen than propane (due to the 1:5 ratio) so oxygen is the limiting reagent.  Again Volume is proportional to number of mole and we see there is a 5:4 ratio between oxygen and water.  Therefore the volume of water vapour produced will be (4/5) * 15 = 12 litres.

The other questions use the same technique and will give you some much needed practice.

Explanation:

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Answer:

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Explanation:

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