Na2CO3 + 2HNO3 -> 2NaNO3 + H2O + CO2
Time(s) Mass of Flask Plus Contents (g)
0 150.50
10 149.30
20 148.10
30 148.10
a)calculate the average overall rate of consumption of sodium carbonate in mol/min.
b)The mass of sodium carbonate consumed in the reaction
I am stuck on those questions for a while. I need your help!
It appears the mass consumed is 150.56-148.10 g
It was consumed in 20 sec, or .3333min
rate= mass/(molmass*.333) in moles/minute.
thank you. I need to answer b. help please? show step by step work if possible thanks!
To solve these questions, we will use the data obtained from the experiment. The reaction equation given is:
Na2CO3 + 2HNO3 -> 2NaNO3 + H2O + CO2
a) To calculate the average overall rate of consumption of sodium carbonate in mol/min, we need to find the change in the amount of sodium carbonate consumed over a specific time interval.
The change in the mass of sodium carbonate consumed can be calculated using the initial and final masses of the flask plus its contents. In this case, the initial mass was 150.50 g, and the final mass after 30 seconds was also 148.10 g. Therefore, the change in mass is:
Change in mass = Initial mass - Final mass
= 150.50 g - 148.10 g
= 2.40 g
Now, we need to convert the change in mass into moles of sodium carbonate. To do this, we need the molar mass of sodium carbonate (Na2CO3), which is calculated as follows:
Molar mass(Na2CO3) = (2 * atomic mass of Na) + atomic mass of C + (3 * atomic mass of O)
= (2 * 22.99 g/mol) + 12.01 g/mol + (3 * 16.00 g/mol)
= 105.99 g/mol
The change in moles of sodium carbonate can be determined by dividing the change in mass by the molar mass of sodium carbonate:
Change in moles = Change in mass / Molar mass(Na2CO3)
= 2.40 g / 105.99 g/mol
≈ 0.023 mol
Since the time interval given is 30 seconds, we need to convert it to minutes:
Time interval (min) = 30 sec / 60 sec/min
= 0.50 min
Finally, we can calculate the average overall rate of consumption of sodium carbonate in mol/min by dividing the change in moles by the time interval:
Average rate of consumption = Change in moles / Time interval
= 0.023 mol / 0.50 min
= 0.046 mol/min
b) To calculate the mass of sodium carbonate consumed in the reaction, we can use the same change in mass value obtained above:
Mass of sodium carbonate consumed = Change in mass
= 2.40 g