For every one molecule of NaHCO3(s) there is one molecule of CO2(g) that forms: NaHCO3(s) + CH3CO2H(aq) --> CO2(g) + H2O(l) + NaCH3CO2(aq) This means that if we know how many moles of gas we need, we need the same number of moles of sodium bicarbonate to produce it. Now, we need something to fill with gas. I'll be filling a 1-quart sealable plastic bag. 1 quart is 946 mL (0.946 L). We can use the ideal gas law to determine how much gas (in moles) is needed to fill 946 mL. Remember there are four variables for the ideal gas law. Ideal Gas Law: PV = nRT P = pressure: typically 715 mm Hg in Spokane <-- unit dictates which R to use V = volume: 1 quart bag = 0.946 L <-- must be in Liters T = room temperature: 20 °C in my lab, +273 = 293 K <-- must be Kelvin n = moles: what we are solving for I used atmospheric pressure in mm Hg, so I'll have to pick the R value with "mm Hg" in the units: R = 62.4 L × m m H g K × m o l Now, use these values to calculate how many moles of gas I'll need to fill the 1-quart bag. Remember, we'll have to use the ideal gas law, solved for n, then plug in the values above. n = P V R T Enter your answer (in moles) below. You should round to three significant figures. (And the answer is very small. Don't panic when
For every one molecule of NaHCO3(s) there is one molecule of CO2(g) that forms:
NaHCO3(s) + CH3CO2H(aq) --> CO2(g) + H2O(l) + NaCH3CO2(aq)
This means that if we know how many moles of gas we need, we need the same number of moles of sodium bicarbonate to produce it.
Now, we need something to fill with gas. I'll be filling a 1-quart sealable plastic bag.
1 quart is 946 mL (0.946 L). We can use the
Ideal Gas Law: PV = nRT
P = pressure: typically 715 mm Hg in Spokane <-- unit dictates which R to use
V = volume: 1 quart bag = 0.946 L <-- must be in Liters
T = room temperature: 20 °C in my lab, +273 = 293 K <-- must be Kelvin
n = moles: what we are solving for
I used atmospheric pressure in mm Hg, so I'll have to pick the R value with "mm Hg" in the units:
R = 62.4 L × m m H g K × m o l
Now, use these values to calculate how many moles of gas I'll need to fill the 1-quart bag. Remember, we'll have to use the ideal gas law, solved for n, then plug in the values above.
n = P V R T
Enter your answer (in moles) below. You should round to three significant figures. (And the answer is very small. Don't panic when you get a decimal number.)
a gas is said to be ideal gas if it follows ideal gas equation PV = RT
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