Answer:
1 mol
Explanation:
The mass of CoCl2 is 129.83. 130 divided by the mass is 1. This is to convert the mass given to mols that exist in the sample.
B. Adjusted that is your answer
I hope it was helpful
Answer:
Na valency 1
Explanation:
Na -sodium.
This element is in the 1A group, so it has 1 electron on the last (valent) level.
So, only 1 electron can participate in forming chemical bond, and therefore the valency of Na is 1.
The theoretical yield of Aluminum oxide is 193.8 grams
<em><u>calculation</u></em>
Theoretical yield is calculate as below
the balanced equation for reaction is as below
4 Al +3 O2 → 2Al2O3
The mole ratio of Al: Al2O3 is 4 :2 therefore moles of Al2O3
= 3.40 x2/4 =1.7 moles
The mole ratio of O2 : Al2O3 is 3:2 therefore moles of Al2O3 is
= 2.85 x 2/3 =1.9 moles
N.b O2 is in excess therefore it's mole is used to determine moles of Al2O3 which is used to calculate theoretical yield.
theoretical yield is therefore = 1.9 moles x 102 g/mol= 193.8 grams
