Answer:
375g of a carbon-14 isotope
Explanation:
From
N/No = (1/2) t/t1/2
N= mass of isotope remaining after time (t)
No= mass of isotope present at the beginning
t= time taken for mass of isotope to decrease to N
t1/2= half life of the isotope.
Since 1 half-life= 5730 years= t1/2
Four half lives= 4(5730) years= t
No= 6000g of isotope
Then we substitute into the formula
N/6000 = (1/2)^4(5730)/5730
N/6000 = (1/2)^4
N= (1/2)^4 ×6000
N= 375g of a carbon-14 isotope
Answer:
C. -CH3
Explanation:
The pKa (acid dissociation constant) of an amino acid residue is primarily influenced by the functional groups attached to the adjacent end of the amino acid chain. The acidity of a functional group depends on how electronegative the functional group is. In the given functional groups' list, the functional group with the least influence on the pKa of the amino acid is the alkyl substituent (-CH3), because they have the least electron-withdrawing capacity.
Answer:
greater than 115 N upwards
Explanation:
Answer:
Check Explanation
Explanation:
The Heat of reaction for the forward reaction is defined as the amount of heat given off or absorbed while the forward reaction is taking place. Mathematically, the heat of reaction for the forward reaction is given as the heat content/heat of formation/Enthalpies of the reaction's products minus the heat content/heat of formation/Enthalpies of the reaction's reactants.
ΔH°run = H°(products) - H°(reactants)
When the heat of reaction is negative, the reaction is said to be exothermic and when it is positive, the reaction is said to be endothermic.
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