Explanation:
Given parameters:
Number of molecules = 4.21 x 10²³ molecules
Unknown parameters:
Number of moles
Solution:
A mole can be defined as the amount of a substance that contains the avogadro's number of particles i.e 6.02 x 10²³
To find the number of moles:
Number of moles =
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Number of moles =
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Number of moles of CaCl₂ = 0.699moles
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mole calculation brainly.com/question/13064292
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Yes, and no. We all should know by know we do need the sun to survive, but we also need for energy is oxygen and the food we eat.
Answer: The rate constant for the reaction is 
Explanation:
Expression for rate law for first order kinetics is given by:

where,
k = rate constant
t = age of sample = 559 min
a = let initial amount of the reactant = 
a - x = amount left after decay process = 



The rate constant for the reaction is 
I know the answer. It is 2 straight chains. lLOL
Answer:
11.22 gm
Explanation:
32.07 gm / mole * .350 mole = 11.22 gm