Answer: The average atomic mass of naturally occurring silicon is 28.08
Explanation:
Mass of isotope Si-28 = 27.9769265327
% abundance of isotope Si-28 = 92.2297% =
Mass of isotope Si-29 = 28.97649472
% abundance of isotope Si-29 = (4.6932)% =
Mass of isotope Si-30 = 29.97377022
% abundance of isotope Si-30 = (3.0872)% =
Formula used for average atomic mass of an element :
Therefore, the average atomic mass of naturally occurring silicon is 28.08
Answer:
The answer is D (contains index fossils)
Explanation:
The theoretical mass of silver that will be produced is calculated as follows
write the reaction equation
Cu + 2Ag(No3) ---> 2Ag + Cu(NO3)2
calculated the moles of each reagent
moles =mass/molar mass
Cu = 6.51g/63.5g/mol= 0.103 moles
Ag(NO3)2 = 28.4 g/169.87g/mol = 0.167 moles
Cu is the limiting reagent therefore the moles Ag= 2 x0.167 = 0.334 moles
mass = moles xmolar mass
0.334mol x 107.87g/mol = 36.02 grams
Answer:
483.27 minutes
Explanation:
using second faradays law of electrolysis