Answer:
![\boxed {\boxed {\sf 104 \%}}](https://tex.z-dn.net/?f=%5Cboxed%20%7B%5Cboxed%20%7B%5Csf%20104%20%5C%25%7D%7D)
Explanation:
Percent ratio is the ratio of the actual yield to the theoretical yield. The formula is below.
![Percent \ Yield} = \frac{{Actual \ Yield}}{{Theoretical \ Yield}} \times 100 \%](https://tex.z-dn.net/?f=Percent%20%5C%20Yield%7D%20%3D%20%5Cfrac%7B%7BActual%20%5C%20Yield%7D%7D%7B%7BTheoretical%20%5C%20Yield%7D%7D%20%5Ctimes%20100%20%5C%25)
The reaction of sodium and chlorine should theoretically yield 12.5 grams, but the actual yield was 13.0 grams.
- actual yield= 13.0 g
- theoretical yield = 12.5 g
Substitute these values into the formula.
![Percent \ Yield} = \frac{{13.0 \ g }}{{12.5 \ g}} \times 100 \%](https://tex.z-dn.net/?f=Percent%20%5C%20Yield%7D%20%3D%20%5Cfrac%7B%7B13.0%20%5C%20g%20%7D%7D%7B%7B12.5%20%5C%20g%7D%7D%20%5Ctimes%20100%20%5C%25)
Divide.
![Percent \ Yield} = 1.04 \times 100 \%](https://tex.z-dn.net/?f=Percent%20%5C%20Yield%7D%20%3D%201.04%20%5Ctimes%20100%20%5C%25)
Multiply.
![Percent \ Yield= 104 \%](https://tex.z-dn.net/?f=Percent%20%5C%20Yield%3D%20104%20%5C%25)
For this reaction, the percent yield is 104%
The constant variable is the math problems, the dependent variable is the calculators, and the independent variables are the students
Remark
The question with these kind of problems is "Which R do you use?" That's where dimensional analysis is so handy. You must look at the units of the givens and choose your R accordingly. You'll see how that works in a moment.
You need to list the givens along with their units and in this case the property you want to solve for. You need all that to determine the R value
Givens
n = 0.25 moles
T = 35°C = 35 + 273.15 = 308.15°K
V = 6.23 L
Pressure = P in kPa
Which R
The units of the R you want has to have units of moles, kPa, °K and liters
The R that you want is 8.314
<em><u>Formula</u></em>
PV = nRT
P 6.23 = 0.25 * 8.314 * 308.15 Combine the left
P*6.23 = 640.5
P = 640.5/6.23 = 102.81 The answer should be 100 kpA of 1.0 * 10^2 kPa
because the number of moles has only 2 sig digs.
But if sig digs are not a problem 102.8 is likely close enough.
Second Question
You are going to have to clean up the numbers. I think I've got only 1 chance at this. The partial pressures of the 2 gases will add up to the total pressure. So the total pressure was 100 approx and the water vapor was 3.36 kPa. The difference is
Total = air + water vapor
100.18 = air + 3.36 about Subtract 3.36 from both sides.
100.18 - 3.36 = 96.82 about. Pick the answer that is closest to that. I'll clean up the numbers if I can.
Answer C
Answer:
Melting ice speeds up climate change.
Explanation:
The Arctic helps to regulate the world's temperature, so as more Arctic ice melts the warmer our world becomes.