Explanation:
Initial mass of the isotope 90-Sr in baby= 1.00 μg
Formula used :

where,
= initial mass of isotope
N = mass of the parent isotope left after the time, (t)
= half life of the isotope = 28.1 years
= rate constant

a) Time taken by the sample, t = 18 years


0.6415 μg will remain after 18 years.
b) Time taken by the sample, t = 70 years


0.1779 μg will remain after 70 years.
Answer:
B
Explanation:
B is the best showing of a chemical reaction out of the choices
Answer:
A synthesis reaction is <em>a reaction that occurs when two or more reactants combine into one product.</em>
Explanation:
A reaction that occurs when two or more reactants combine into one product is called a synthesis reaction.
A reaction that occurs when one element within a compound is exchanged with another element is called a single replacement reaction.
A reaction that occurs when a substance combines with molecular oxygen, releasing light and energy is called combustion.
A reaction that occurs when a single substance breaks apart and forms two or more new substances is called decomposition.
<u>Answer:</u> The molarity of KBr solution is 0.605 M
<u>Explanation:</u>
Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L.
The formula used to calculate molarity:
.....(1)
Given values:
Given mass of KBr = 54.0 g
Molar mass of KBr = 119 g/mol
Volume of the solution = 750 mL
Putting values in equation 1, we get:

Hence, the molarity of KBr solution is 0.605 M
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➷ Ammonium bromate
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