Which element has the least metallic character among Li,Be,Na and Mg
1 answer:
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Answer:
It will take 6.6 hours for 75% of the lead to decay.
Explanation:
The radioactive decay follows first order rate law
The half life and rate constant are related as
The rate law for first order reaction is
Where
A0 = initial concentration = 1 g
At= final concentration = 0.25 g (as 75% undergoes decay so 25% left]
Answer:
Dimer of two peptide chains with 1 mole of molybdenum metal each.
Explanation:
Percentage of molybdenum in protein = 0.08%
Molecular mass of nitrate reductase = 240,000 g
Mass of molybdenum = x
Moles of molybdenum =
Each peptide chain of nitrate reductase contain 1 mole of molybdenum.
This means that nitrate reductase is composed of to two peptide chains. And in each peptide there is a single mole of molybdenum metal.
Answer: -
2.5
Explanation: -
Initial [HNO₂] = 2.00 M
ka = 5.00 x 10 ⁻⁶
ICE table for HNO₂ =
[
Ka =
5.00 x 10-6 =
x = 0.0032 M
pH = - log [H⁺]
= - log 0.0032
= 2.5