The concentration of diluted solution is found to be 0.421 M
<u>Explanation:</u>
It is given that a stock solution (400 ml) should be diluted to 750 ml, we need to find the concentration of the diluted solution using the Law of Volumetric analysis,
V1M1 = V2M2
V1 being the volume of the stock solution = 400 ml
M1 being the molarity of the stock solution = 0.789 M
V2 being the volume of the diluted solution = 750 ml
M2 being the molarity of the diluted solution = ?
Now we have the molarity of the diluted solution by rearranging the above equation as,
M2 =
Now plugin the values as,
M2 =
= 0.421 M
So the molarity of diluted solution is found to be 0.421 M.
Answer:
The percent by mass of water in this crystal is:
Explanation:
This exercise can be easily solved using a simple rule of three where the initial weight of the hydrated crystal (6,235 g) is taken into account as 100% of the mass, and the percentage to which the mass of 4.90 g corresponds (after getting warm). First, the values and unknown variable are established:
- 6,235 g = 100%
- 4.90 g = X
And the value of the variable X is found:
- X = (4.90 g * 100%) / 6,235 g
- X = approximately 78.6%.
The calculated value is not yet the percentage of the water, since the water after heating the glass has evaporated, therefore, the remaining percentage must be taken, which can be calculated by subtraction:
- Water percentage = Total percentage - Percentage after heating.
- <u>Water percentage = 100% - 78.6% = 21.4%</u>
C. All the known elements that exist in the world today
Answer:
In the picture, it's shown that the energy from the sun and carbon dioxide is absorbed by plants through the leaf and is used for cooking food in plants. It is also shown that nutrients and water needed for the plant is absorbed through the roots of the plant. And it's also shown that cooking results in the formation of Glucose and Oxygen in which oxygen is released into the atmospehere and the glucose is stored in the plant for its own needs.
Answer:
32 K is approx. -241.15° C