Answer: Thus 44 g of 
will be produced if 30 g of 
were reacted with an excess of oxygen
Explanation:
To calculate the moles :
The balanced chemical equation is:
As is the limiting reagent as it limits the formation of product and 
is the excess reagent.
According to stoichiometry :
1 mole of produce = 6 moles of
Thus 0.17 moles of will produce=
of
Mass of 
Thus 44 g of will be produced if 30 g of were reacted with an excess of oxygen.
Answer:
45, 34, 36
Explanation:
The atomic number of Selenium is 34 and the atomic number is 79 also the atom has gained two electron denoted by superscript -2
number of neutrons = mass number - atomic number = 79 - 34 = 45
number of proton = atomic number = 34
number of electron = 34 + 2 = 36. In an atom the number of proton is always equal to number of electron if the atom is neutral but this Se atom has gain two so the number of electron will exceed the number of proton by 2.
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A . Luminosity versus temperature
Theoretical yield:
02 -> H2O
1mol -> 2mol
2mol -> 4mol
32g -> 72g
Theoretical yield = 72g
Percent yield = actual yield/theoretical yield * 100
= 33.1/72 *100
=45.97%
