Which of the following equations is balanced?
2 answers:
Answer: Option (A) is the correct answer.
Explanation:
A balanced equation is defined as the equation which contains same number of atoms on both reactant and product side.
For example,
Here, no. of atoms on reactant side are as follows.
- P = 4
- O = 10
No. of atoms on product side are as follows.
- P = 4
- O = 10
As the number of atoms on both reactant and product side are same in this reaction equation. Hence, it is a balanced reaction equation.
Thus, we can conclude that equations is balanced.
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Answer:
The molar concentration of Cu²⁺ in the initial solution is 6.964x10⁻⁴ M.
Explanation:
The first step to solving this problem is calculating the number of moles of Cu(NO₃)₂ added to the solution:
n = 1.375x10⁻⁵ mol
The second step is relating the number of moles to the signal. We know the the n calculated before is equivalent to a signal increase of 19.9 units (45.1-25.2):
1.375x10⁻⁵ mol _________ 19.9 units
x _________ 25.2 units
x = 1.741x10⁻⁵mol
Finally, we can calculate the Cu²⁺ concentration :
C = 1.741x10⁻⁵mol / 0.025 L
C = 6.964x10⁻⁴ M