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3 years ago

Question 9 (1 point)

Chemistry

1 answer:

Juliette [100K]3 years ago

7 0

Noble gases

Explanation:

Electronic configuration 1s² 2s² 2p⁶

The element belongs to the group of the noble gases.

The noble gases have complete outer shell configuration of their atoms.
we can infer that the configuration above is for an element in the p-block because the last sub-level filled is the p-orbital.
The elements therefore belongs to the p-block
The block is from group 111A to O
Only the halogens and noble gases fits this picture from the option.
The outer most p-subshell have three orbitals requiring 6 electrons to fill them up.
This makes a complete and stable configuration.
The highest energy level of 2 is also made up of 8 electrons, an octet.
This is why we can conclude that they are noble gases.

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A balloon contains 0.15 moles of co2 gas. how many molecules of co2 are in the balloon?

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Read 2 more answers

Alum is a compound used in a variety of applications including cosmetics, water purification, and as a food additive. It can be

mylen [45]

yield = 52.23 %

Explanation:

We have the following chemical reaction:

2 Al (s) + 2 KOH (aq) + 4 H₂SO₄ (aq) + 10 H₂O → 2 KAl(SO₄)₂·12 (H₂O) (s) + 3 H₂ (g)

mass of aluminium = mass of bottle with aluminium pieces - bottle mass

mass of aluminium = 10.8955 - 9.8981 = 0.9974 g

mass of alum = mass of bottle with final product - bottle mass

mass of alum = 19.0414 - 9.8981 = 9.1433 g

number of moles = mass / molecular weight

number of moles of aluminium = 0.9974 / 27 = 0.03694 moles

number of moles of alum (practical) = 9.1433 / 474 = 0.01929 moles

To calculate the theoretical quantity of alum that should be obtained from 0.03694 moles of aluminium we devise the following reasoning:

if 2 moles of aluminium produce 2 moles of alum

then 0.03694 moles of aluminium produce X moles of alum

X = (0.03694 × 2) / 2 = 0.03694 moles of alum (theoretical)

yield = (practical quantity / theoretical quantity) × 100

yield = (0.01929 / 0.03694) × 100

yield = 52.23 %

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