Answer:
Percent yield = 88%
Explanation:
Given data:
Mass of C₇H₆O₃ = 200.0 g
Actual yield of aspirin = 231 g
Percent yield = ?
Solution:
Chemical equation:
C₇H₆O₃ + C₄H₆O₃ → C₉H₈O₄ + C₂H₄O₂
Number of moles of aspirin:
Number of moles = mass/molar mass
Number of moles = 200.0 g/ 138.12 g/mol
Number of moles = 1.45 mol
Now we will compare the moles of aspirin with C₇H₆O₃.
C₇H₆O₃ : C₉H₈O₄
1 : 1
1.45 : 1.45
Theoretical yield of aspirin:
Mass = number of moles × molar mass
Mass = 1.45 g × 180.158 g/mol
Mass = 261.23 g
Percent yield:
Percent yield =( actual yield / theoretical yield )× 100
Percent yield = (231 g/ 261.23 g)× 100
Percent yield = 0.88 × 100
Percent yield = 88%
Answer:
pH = 4
Explanation:
pH is a base 10 logarithmic scale
1000 = 10^3
7 -3 = pH = 4
Means exact place on a location
Answer:
2 H2 + O2 = 2 H2O
Explanation:
H2 + O2 = H2O
- Left side: 2H and 2O
- Right side: 2H and 1O
Add a coefficient of 2 to the right side
H2 + O2 = 2 H2O
- Left side is still: 2H and 2O
- Right side now has: 4H and 2O
Add a coefficient of 2 to H2 on the left side
2 H2 + O2 = 2 H2O
- Left side still has: 4H and 2O
- Right side now has: 4H and 2O
2 H2 + O2 = 2 H2O is the balanced equation.
How to convert miles per hour to centimeters per second [mi/h to cm/sec]:
vcm/sec = 44.704 × vmi/h
How many centimeters per second in a mile per hour:
If vmi/h = 1 then
vcm/sec = 44.704 × 1 = 44.704 cm/sec
How many centimeters per second in 50 miles per hour:
If vmi/h = 50 then
vcm/sec = 44.704 × 50 = 2 235.2 cm/sec
does this help?