Answer:
50mL
Explanation:
Using Boyle's law equation as follows:
P1V1 = P2V2
Where;
P1 = initial pressure (torr.)
P2 = final pressure (torr.)
V1 = initial volume (mL)
V2 = final volume (mL)
According to the information provided in the question,
V1 = 25.0mL
V2 = ?
P1 = 760 torr.
P2 = 380 torr.
Using P1V1 = P2V2
V2 = P1V1//P2
V2 = (760 × 25) ÷ 380
V2 = 19000 ÷ 380
V2 = 50mL
Answer:
52.2g of KCl would be left
The mass of KCl will remain despite the solution is been heated
Explanation:
When you are heating a solution, just the solvent (In this case, water), will be evaporated and, in theory, the mass of KCl will remain despite the solution is been heated.
Now, the mass of KCl that you can obtain from 350mL of a 2.0M solution will be:
<em>Moles KCl:</em>
350mL = 0.350L * (2.0mol / L) = 0.700 moles
<em>Mass KCl -Molar mass: 74.55g/mol-:</em>
0.700mol * (74.55g/mol) = 52.2g of KCl would be left
Answer:
Explanation:
First, we are going to need the water specific volume at 15ºC: v=0.001001 . The density '' of the water is the inverse of the specific volume:
First, consider the mass flow, which is related to the volumetric flow (density and velocity) and the area:
The area of each cross-section is:
(in square meters). Here, the radius was not used but the diameter, which means a division by 4 (2 squared).
From mass flow isolate the velocity and calculate it:
The work of the pump is calculated considering an energy balance on the pump:
Considering the isentropic process may give us the relation:
Applying that to the pump,
Multiplying it by the mass flow:
The work is negative because it is entering to the system, but the required is positive. (It is just a standard rule)
Answer: mg is 3
Explanation:
Element Symbol # of Atoms
Magnesium Mg 3
Oxygen O 6
Hydrogen H 6
The answer is the third one