Answer:
Back titration is a titration done in reverse; instead of titrating the original sample, a known excess of standard reagent is added to the solution, and the excess is titrated.
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Answer:
The transition which is associated with the greatest energy change is from n=1 to n=3.
Explanation:
where,
= energy of orbit
n = number of orbit
Z = atomic number
Energy of n = 1 in an hydrogen like atom:
Energy of n = 2 in an hydrogen like atom:
Energy of n = 3 in an hydrogen like atom:
Energy of n = 5 in an hydrogen like atom:
1) Energy change transition from n = 1 to n = 3 occurs .
Let energy change be E.
(absorption)
2) Energy change transition from n = 2 to n = 1 occurs .
Let energy change be E.
(emission)
3) Energy change transition from n = 3 to n = 2 occurs .
Let energy change be E.
(emission)
4) Energy change transition from n = 3 to n = 5 occurs .
Let energy change be E.
(absorption)
Highest magnitude of energy corresponds to the greatest energy change.So,the transition which is associated with the greatest energy change is from n=1 to n=3.
Answer:
(a) HCl is the limiting reactant.
(b) 28.45 g
(c) 19.10 g.
Explanation:
(a) 4HCL(aq) + MnO2(s) ----> MnCl2(aq) + 2H2O(l) + Cl2(g)
Using the relative atomic masses:
4 * (1.008 + 35.45( g of HCl react with (54.983 + 2*15.999) g of MnO2.
145.832 g HCl reacts with 86.981 g MnO2.
So 47.7 g HCl reacts with (86.981 / 145.832) * 47.7 = 28.451 g MnO2.
We have 42.5 g of MnO2 so HCl is the limiting reactant.
(b) The theoretical yield of Cl2 is (70.9 /86.981) * 28.451 = 23.91 g.
(c) The actual yield of chlorine is 23.91 * 0.799 = 19.10 g.
The answer is most likely A. Instructions for inherited traits.