Explanation:
The given data is as follows.
Current (I) = 3.50 amp, Mass deposited = 100.0 g
Molar mass of Cr = 52 g
It is known that 1 faraday of electricity will deposit 1 mole of chromium. As 1 faraday means 96500 C and 1 mole of Cr means 52 g.
Therefore, 100 g of Cr will be deposited by "z" grams of electricity.
![z \times 52 g = 96500 \times 100 g](https://tex.z-dn.net/?f=z%20%5Ctimes%2052%20g%20%3D%2096500%20%5Ctimes%20100%20g)
z = ![\frac{96500 \times 100 g}{52 g}](https://tex.z-dn.net/?f=%5Cfrac%7B96500%20%5Ctimes%20100%20g%7D%7B52%20g%7D)
= 185576.9 C
As we know that, Q = I × t
Hence, putting the given values into the above equation as follows.
Q = I × t
185576.9 C =
t = 53021.9 sec
Thus, we can conclude that 100 g of Cr will be deposited in 53021.9 sec.
Given :
A 3.82L balloon filled with gas is warmed from 204.9K to 304.8 K.
To Find :
The volume of the gas after it is heated.
Solution :
Since, their is no information about pressure in the question statement let us assume that pressure is constant.
Now, we know by ideal gas equation at constant pressure :
![\dfrac{V_1}{V_2} = \dfrac{T_1}{T_2}\\\\\dfrac{3.82}{V_2}= \dfrac{204.9}{304.8}\\\\V_2 = \dfrac{304.8}{204.9} \times 3.82\\\\V_2 = 5.68 \ L](https://tex.z-dn.net/?f=%5Cdfrac%7BV_1%7D%7BV_2%7D%20%3D%20%5Cdfrac%7BT_1%7D%7BT_2%7D%5C%5C%5C%5C%5Cdfrac%7B3.82%7D%7BV_2%7D%3D%20%5Cdfrac%7B204.9%7D%7B304.8%7D%5C%5C%5C%5CV_2%20%3D%20%5Cdfrac%7B304.8%7D%7B204.9%7D%20%5Ctimes%203.82%5C%5C%5C%5CV_2%20%3D%205.68%20%5C%20L)
Hence, this is the required solution.
The mass of a NaCl solution that is required to prepare 0.40 L of a 0.75 M solution is 17.55g. Details about mass can be found below.
<h3>How to calculate mass?</h3>
The mass of a substance can be calculated by multiplying the number of moles by its molar mass.
However, the number of moles of a solution must be initially calculated by using the following formula:
molarity = no of moles ÷ volume
no of moles = 0.75 × 0.40
no of moles = 0.3 moles
mass of NaCl = 0.3 × 58.5 = 17.55g
Therefore, the mass of a NaCl solution that is required to prepare 0.40 L of a 0.75 M solution is 17.55g.
Learn more about mass at: brainly.com/question/19694949
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A solution is a mixture of two or more substances combined so that it is uniform, which means you cannot see the components. <span />