Answer: The original volume in liters was 0.0707L
Explanation:
Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.
The combined gas equation is,
where,
= initial pressure of gas = 0.85 atm
= final pressure of gas = 456 mm Hg = 0.60 atm (760mmHg=1atm)
= initial volume of gas = ?
= final volume of gas = 94.0 ml
= initial temperature of gas = 
= final temperature of gas = 
Now put all the given values in the above equation, we get:
(1L=1000ml)
Thus the original volume in liters was 0.0707L
Answer:
14 mol O₂
Explanation:
The reaction between CO and O₂ is the following:
CO + O₂ → CO₂
We balance the equation with a coefficient 2 in CO and CO₂ to obtain the same number of O atoms:
2CO + O₂ → 2CO₂
As we can see from the balanced equation, 1 mol of O₂ is required to react with 2 moles of CO. Thus, the conversion factor is 1 mol of O₂/2 mol CO. We multiply the moles of CO by the conversion factor to calculate the moles of O₂ that are required:
28 mol CO x 1 mol of O₂/2 mol CO = 14 mol O₂
Ah, stoichiometry. Have you ever done ratios before?
When you are given chemical reactions, all of the moles of reactant and product are proportional. This means that they're in ratio. Say we double the number of moles of water to 12 moles. How many moles do you think C2H6 will have? It'd be 4 moles, since just like water it was doubled since they're in proportion.
You can also think about that example above like a literal ratio. Since the original ratio is 2:6, it then turns into n:12, with n being the unknown number of moles of C2H6. Since ratios we know that ratios are always equal can be converted to fraction:
2/6 = n/12
Cross multiply:
24 = 6n
n = 4 moles
Makes sense? On to the actual question.
We're looking at the proportion between oxygen and carbon dioxide. Let's write that into a ratio:
7:4
Since there are seven moles of oxygen and four moles of carbon dioxide.
The number of moles of carbon dioxide is reduced to 1 mole. You could simply divide seven by 4 to find your answer (Since 4 was divided by 4 to make 1), but let's use the ratio method just in case questions in the future aren't this convenient:
7:4 becomes n:1
Convert to fraction:
7/4 = n/1
Cross multiply;
7 = 4n
Divide:
n = 7/4
Convert to decimal:
n = 1.75
The answer is Option C, 1.75 moles.
Let me know if you want me to explain anything I did here.
Good luck!
-T.B.
Answer:
- 0.022% starch/min
Explanation:
Initial Conc. = 0.050 %
Final conc. = 0.028 %
Time = 1 min
Rate of Reaction = Rate of disappearance = Change in concentration of starch / time
Rate of disappearance = [0.028 - 0.050 ] / 1
Rate of disappearance = 0.022 / 1 = - 0.022% starch/min
The negative sign denotes that the starch is disappearing.
Hello there.
The answer is C. There is a triple carbon-bond in the molecule.
Have a nice day!
~Ruru
