A chemist determines by measurements that 0.030 moles of nitrogen gas participate in a chemical reaction. calculate the mass of
1 answer:
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<u>Answer:</u> The correct answer is Option D.
<u>Explanation:</u>
We are given that car travels with a speed of 80 km/hr and we need to convert it into hm/s.
For that we use the conversions:
1 kilometer = 10 hectometer
And, 1 hour = 3600 seconds
To convert the quantity into hm/s, we multiply the numerator which is 80 by 10 to convert the whole quantity into hm/hr and now, to convert the result into hm/s finally, we divide the result by 3600.
Hence, the correct answer is option D.
Answer : The volume of reactant measured at STP left over is 409.9 L
Explanation :
First we have to calculate the moles of and
by using ideal gas equation.
<u>For :</u>
where,
P = Pressure of gas at STP = 1 atm
V = Volume of gas = 1580 L
n = number of moles = ?
R = Gas constant =
T = Temperature of gas at STP = 273 K
Putting values in above equation, we get:
<u>For :</u>
where,
P = Pressure of gas at STP = 1 atm
V = Volume of gas = 3510 L
n = number of moles = ?
R = Gas constant =
T = Temperature of gas at STP = 273 K
Putting values in above equation, we get:
Now we have to calculate the limiting and excess reagent.
The balanced chemical reaction is,
From the balanced reaction we conclude that
As, 3 mole of react with 1 mole of
So, 156.6 moles of react with
moles of
From this we conclude that, is an excess reagent because the given moles are greater than the required moles and
is a limiting reagent and it limits the formation of product.
Now we have to calculate the excess moles of reactant (unreacted gas).
Excess moles of reactant = 70.49 - 52.2 = 18.29 moles
Now we have to calculate the volume of reactant, measured at STP, is left over.
where,
P = Pressure of gas at STP = 1 atm
V = Volume of gas = ?
n = number of moles of unreacted gas = 18.29 moles
R = Gas constant =
T = Temperature of gas at STP = 273 K
Putting values in above equation, we get:
Therefore, the volume of reactant measured at STP left over is 409.9 L