(1) Ni2+ + 2e---> Ni (3) Zn--> Zn2+ + 2e-
(2) Sn + 2e---> Sn2+ (4) Fe3+--> Fe2+ + e-
The thirdreaction of the zinc-releasing electron and zinc ion will occur as the half-reaction at the anode of the voltaic cell. Thus, option 3 is the correct option.
A half-reaction is a depiction of the oxidation or the reduction half of a redox reaction that involves the stating of the oxidation states and the release or the absorption of the electrons.
The anode is an electrode of the voltaic cell where the oxidation reaction takes place. The oxidation results in the loss of the electrons and hence, reactions 1 and 2 cannot occur at the anode. The fourth reaction is also not possible as iron cannot lose its electron.
Therefore, option 3. Zn → Zn²⁺ + 2e⁻ will occur at the anode.
Learn more about anode and oxidation here:
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Answer: A) 149.10 g/mol
Explanation:
First, I list what I know, which are the molar masses of N, H, P, and O:
N = 14.01 g/mol
H = 1.01 g/mol
P = 30.97 g/mol
O = 15.99 g/mol
Now, I determine how many molecules of N, H, P, and O there are, starting with (NH₄)₃:
With just NH₄, there would be 1 N and 4 H, but since there are () around it with a subscript of 3, we multiply 3 by both N and H₄, so:
1*3 = 3 N
1*12 = 12 H
Now, we look at PO₄:
The subscript of 3 is before PO₄, so we do not apply that to PO₄:
1 P
4 O
Now, we know the molar masses and number of each of the elements, so we can determine the molar mass of the entire compound.
First, I calculate the total molar masses of each of the elements by multiplying the number of molecules of the element by the element's molar mass:
3 N = 3*14.01 g/mol = 42.03 g/mol
12 H = 12*1.01 g/mol = 12.12 g/mol
1 P = 1*30.97 g/mol = 30.97 g/mol
4 O = 4*15.99 g/mol = 63.96 g/mol
Then, I calculate the total molar mass of the compound by adding the total molar masses of each of the elements together:
42.03 + 12.12 + 30.97 + 63.96 = 149.08 g/mol
I probably used slightly different approximations of the molar masses of each element, but my answer is closest to choice A) 149.10 g/mol.
So, if there are no () around a compound, like PO₄, the subscript only applies to the element it's attached to, so there are 4 molecules of O and only 1 molecule of P.
If there are () around a compound with a subscript, like (NH₄)₃, the subscript after the () gets applied to each element inside the ().
I hope this helps! :)
The molar mass of the compound (NH₄)₃PO₄ is calculated by adding up the molar masses of all its constituent elements. The calculated molar mass is approximately 149.09 g/mol, which corresponds to answer choice (A) 149.10 g/mol.
To calculate the molar mass of a compound, you multiply the quantity of each element by its atomic mass and then sum them all up. The formula (NH₄)₃PO₄ contains Nitrogen (N), Hydrogen (H), Phosphorous (P), and Oxygen (O). The atomic masses of these elements are approximately 14.01 g/mol, 1.01 g/mol, 30.97 g/mol, and 16.00 g/mol respectively. So for the compound (NH₄)ᵣPO₄, the molar mass would be as follows:
(3*N) + (12*H) + (1*P) + (4*O) = (3*14.01) + (12*1.01) + 30.97 + (4*16.00) = 149.09 g/mol approximately
Therefore, the closest answer choice to the correct molar mass is (A) 149.10 g/mol.
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Answer:
Explanation:
The density of a substance can be found by using the formula
From the question
mass = 411 g
volume = 384 cm³
We have
We have the final answer as
Hope this helps you
B. Metallic
C. Polar covalent
D. Nonpolar covalent
Answer:
Metallic
Explanation:
Iron is a metal