The atomic number of an element is equal to the number of protons. It the element has a neutral charge then the number of protons equals the number of electrons. The number of neutrons equals the atomic mass minus the atomic number.
ex:
Sodium
Atomic number: 11
Atomic mass: 23
Protons: 11
Electrons: 11
Neutrons: 23 - 11 = 12
Answer:
I think sodium it may be wrong soŕry
I think you forgot to give the options along with the question. I am answering the question based on my knowledge and research. "Test a third group that does not receive the supplement" would be the procedure that would have made the <span>outcome of this study more valid. I hope the answer helps you.</span>
Given :
A balanced chemical equation :
![Zn +Cl_2->ZnCl_2](https://tex.z-dn.net/?f=Zn%20%2BCl_2-%3EZnCl_2)
To Find :
How many grams of zinc are needed to produce 12 grams of zinc chloride.
Solution :
Moles of
,
![n=\dfrac{Given \ wt}{Molecular\ Mass}\\\\n =\dfrac{12}{136.30}\ mol\\\\n=0.088\ mol](https://tex.z-dn.net/?f=n%3D%5Cdfrac%7BGiven%20%5C%20wt%7D%7BMolecular%5C%20Mass%7D%5C%5C%5C%5Cn%20%3D%5Cdfrac%7B12%7D%7B136.30%7D%5C%20mol%5C%5C%5C%5Cn%3D0.088%5C%20mol)
Now, by balanced chemical equation we can say that 1 mol of Zn produce
1 mol of
.
So, 0.088 mol of Zn is required to produced 0.088 mol of
.
![Mass \ required = molecular \ mass \times moles\\\\m = 65.38 \times 0.088\\\\m=5.8 \ gm](https://tex.z-dn.net/?f=Mass%20%5C%20required%20%3D%20molecular%20%5C%20mass%20%5Ctimes%20moles%5C%5C%5C%5Cm%20%3D%2065.38%20%5Ctimes%200.088%5C%5C%5C%5Cm%3D5.8%20%5C%20gm)
Therefore, 5.8 grams of zinc is required.
Hence, this is the required solution.
Answer:
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