Answer:
0.08097 grams of nitrate ions are there in the final solution.
Explanation:
Moles of cobalt(II) nitrate ,n= 
Volume of the cobalt(II) nitrate solution, V = 100.0 mL = 0.1 L
Let the molarity of the solution be 
A students then takes 4 .00 mL of solution and dilute it to 275 ml.
(molarity after dilution)
(after dilution)
Molarity of the of solution after dilution is 0.002375 M.
1 mol of cobalt(II) nitrate gives 2 moles of nitrate ions. Then 0.002375 M solution of cobalt (II) nitrate will give:
![[NO_3^{-}]=\frac{2}{1}\times 0.002375 M=0.004750 M](https://tex.z-dn.net/?f=%5BNO_3%5E%7B-%7D%5D%3D%5Cfrac%7B2%7D%7B1%7D%5Ctimes%200.002375%20M%3D0.004750%20M)
Moles of nitrate ions = n
Volume of the solution = 275 mL = 0.275 L
Molarity of the nitrate ions = ![[NO_3^{-}]=0.004750 M](https://tex.z-dn.net/?f=%5BNO_3%5E%7B-%7D%5D%3D0.004750%20M)
![[NO_3^{-}]=\frac{n}{0.275 L}](https://tex.z-dn.net/?f=%5BNO_3%5E%7B-%7D%5D%3D%5Cfrac%7Bn%7D%7B0.275%20L%7D)
n = 0.001306 mol
Mass of 0.001306 moles of nitrate ions:
0.001306 mol × 62 g/mol= 0.08097 g
0.08097 grams of nitrate ions are there in the final solution.
Answer:
When the operation of the voltaic cell, which is formed of an aluminum and silver strip takes place, the atom of aluminum loses three of its electrons and the Al3+ formed moves within the solution. The Al3+ ion gets dissolved within the solution and the electrons lost in the process moves through the wire and get acquired by the ions of silver, which then get reduced to solid Ag resulting in the mass gain of silver strip.
<h3>Answer:</h3>
0.8133 mol
<h3>Solution:</h3>
Data Given:
Moles = n = ??
Temperature = T = 25 °C + 273.15 = 298.15 K
Pressure = P = 96.8 kPa = 0.955 atm
Volume = V = 20.0 L
Formula Used:
Let's assume that the Argon gas is acting as an Ideal gas, then according to Ideal Gas Equation,
P V = n R T
where; R = Universal Gas Constant = 0.082057 atm.L.mol⁻¹.K⁻¹
Solving Equation for n,
n = P V / R T
Putting Values,
n = (0.955 atm × 20.0 L) ÷ (0.082057 atm.L.mol⁻¹.K⁻¹ × 298.15 K)
n = 0.8133 mol
<h2>5060 have three significant figures : Explanation given below </h2>
Explanation:
Significant figures
The significant figures (also known as the significant digits and decimal places) of a number are digits that possess certain meaning .
It includes all digits except: zeros
Rules to find significant figures
1.All non-zero digits are considered significant. For example, 23 has two significant figures.
2.Zeros in between two non-zero digits are significant: like in 202.1201 has seven significant figures.
3.Zeros to the left of the significant figures are not significant. For example, .000021 has two significant figures, zeros have no value .
4.Zeros to the right of the significant figures are significant.
That is the reason in number 5060 , it has 3 significant figures .
Answer:
The adjustable legs and the table of sand.
<em>Note:The question is incomplete. The complete question is given below.</em>
Using Models to Answer Questions About Systems
Armando’s class was looking at images of rivers formed by flowing water. Most of the rivers were wide and shallow, but one river was narrow and deep. Armando’s class thinks that this river is narrow and deep because:
- the hill that the water flowed down was very steep, or
- the sand grains that the water flowed through were very small.
Armando designed the model below to try to answer the question: Why is this river so narrow and deep?
Explanation:
The model designed by Armando will be helpful to answer the question because of the following features it possesses:
1. An adjustable leg- since one of the hypotheses put forward by the class to explain why the river was narrow and deep was that the hill that the water flowed down was very steep, the adjustable legs can be lowered or raised in order to make the slope shallower or steeper so that their hypothesis can be tested.
2. A table of sand- the table of sand serves as the streambed. By adjusting the size of the sand grains to be larger or smaller, the students will be able to to test their second hypothesis that the small size sand grains that the water flowed through was the reason for the river to be narrow and deep.
The results of their experiments will enable them to come to a conclusion.
