A student generates H2(g) over water using the reaction between zinc and hydrochloric acid
Zn(s)+ 2HCl(aq)---> ZnCl2(aq)+ H2(g)
Data:
Mass of vial and zinc 15.5082
mass of vial 15.3972
mass of zinc 0.111
final burette reading 45.30mL
barometric pressure: Patm 100.6kPa
temperature of trapped gas 24.3C
vapour pressure of water at 24.3 C: PH2O 3.004kPa
diff in solution lvls inside and outside burette 162mm H2O
calculate the pressure exerted by H2 gas alone in kPa and the kelvin temperature of the H2 gas
I know it seems like the same question but it's actually another part can you help me with the formulas i need to use please?
To calculate the pressure exerted by H2 gas alone in kPa, you can use the ideal gas law equation:
PV = nRT
Where:
P is the pressure of the gas (in kPa)
V is the volume of the gas (in L)
n is the number of moles of gas
R is the ideal gas constant (8.31 J/(mol·K))
T is the temperature of the gas (in Kelvin)
In this case, we need to determine the number of moles of H2 gas that was produced during the reaction. To do this, we can use the stoichiometry of the balanced equation:
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
From the balanced equation, we can see that 1 mole of Zn reacts to produce 1 mole of H2 gas. Therefore, the number of moles of H2 gas would be the same as the number of moles of Zn used in the reaction.
To find the number of moles of Zn, we can use the mass of Zn and its molar mass (atomic weight of Zn):
molar mass of Zn = 65.38 g/mol
moles of Zn = mass of Zn / molar mass of Zn
Now, we need to calculate the volume of H2 gas using the ideal gas law equation:
V = (45.30 mL - 162 mm H2O) / 1000 mL/L
Note: We subtract the difference in solution levels inside and outside the burette, converted from mm H2O to mL, to get the true volume of the H2 gas.
Now, we can rearrange the ideal gas law equation to solve for P (pressure):
P = nRT / V
Substituting the values we calculated earlier, we can find the pressure exerted by the H2 gas alone (P).
To calculate the Kelvin temperature of the H2 gas, we can convert the given temperature from Celsius to Kelvin:
Kelvin temperature (K) = Celsius temperature (°C) + 273.15
Now, you can use these formulas and calculations to find the pressure exerted by the H2 gas alone in kPa and the Kelvin temperature of the H2 gas.