50moles of H₂O
Explanation:
Given parameters:
Mass of hydrogen burning = 100g
Unknown:
Number of moles of water formed = ?
Solution:
To solve this problem, we have to apply the mole's concept. We should first obtain the balanced equation for the reaction. Then express the mass as moles and compared to that of water.
Solve from the known to the unknown;
Equation:
2H₂ + O₂ → 2H₂O
Number of moles of Hydrogen gas =
Molar mass of H₂ = 2(1) = 2g/mol
Number of moles = = 50moles
From the equation of the reaction;
2 mole of H₂ produced 2 mole of H₂O;
Then 50 mole of H₂ will produce 50moles of H₂O
50 mole of water will be formed
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Answer: The pH 0f 0.10 solution of HCl is 1.00
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
According to stoichiometry,
1 mole of gives 1 mole of
Thus moles of
gives =
moles of
Putting in the values:
Thus pH 0f 0.10 solution of HCl is 1.00
Answer : The final number of moles of gas that withdrawn from the tank to lower the pressure of the gas must be, 0.301 mol.
Explanation :
As we know that:
At constant volume and temperature of gas, the pressure will be directly proportional to the number of moles of gas.
The relation between pressure and number of moles of gas will be:
where,
= initial pressure of gas = 24.5 atm
= final pressure of gas = 5.30 atm
= initial number of moles of gas = 1.40 moles
= final number of moles of gas = ?
Now put all the given values in the above expression, we get:
Therefore, the final number of moles of gas that withdrawn from the tank to lower the pressure of the gas must be, 0.301 mol.