The number 16 next to the elemental symbol of Nitrogen
which is N indicates the mass number of the element. Now the atomic number of N
is 7, this is also equal to the number of protons or electrons in the nucleus. So
the balance is 16 – 7 = 9 which is being occupied by the neutrons. Therefore
the number of neutrons is:
<span>9</span>
Ca=40
C=12
O=16
1 mole of CaCO3 has 100 grams
So 50 grams is 0.5 mole
The two types of energy changes that occur are heat and light changes.
Answer: 0.011 moles.
Explanation:-
To calculate the moles, we use the equation:

Given :
Mass of copper = 0.71 g
Molar mass of copper = 63.5 g/mol
Putting i the values, we get:

Thus the number of moles of copper in 0.71 g of copper is 0.011 moles.
Explanation:
<em><u>SO2 + 2NaOH → Na2SO3 + H2O</u></em>
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