<span>subshells have two reasons of stability-
</span><span> 1) half filled and full filled subshells lead to symmetry as symmetry always increases stability in the nature.
</span>2)<span> in half filled and full filled subshells there are maximum no Of exchanges so exchanges releases energy so it increase stability.. Exchange of e-s also can b understood as delocalization of e-s which is similar like resonance and resonance always increases stability</span>
Answer:
B. The student conducted the reaction in an open beaker, which allowed one of the products, a gas, to escape.
Explanation:
Based on the law of conservation of mass, matter is neither created nor destroyed during the course of a chemical reaction.
By this premise, the mass of reactants and products must remain the same during the course of a reaction.
- Here we find that this is not the case.
- The mass of the product reported is less than the mass of the reactants.
- The problem is that the mass of the gas bubbles produced during the course of this reaction was not accounted for.
- This leaves a mass deficit already
Silicon, Germanium of Group 14
Sodium:
moles = mass/RFM = 8.3/23 = 0.3608..
Chlorine:
moles = mass/RFM = 4.5/71 = 0.06
Ratio of Na to Cl is 2:1
So 0.06 x 2 = 0.12
So we know that the Na is in excess
Now we have to figure out by how much:
Mass = moles x RFM = 0.12 x RFM of 2NaCl = 0.12 x 58.5 = 7.4 (roughly)
Now to figure out by how much do 8.3 + 4.5 = 12.7 and do 12.7 - 7.4 = 5.3 (roughly)
So your answer is A