7. If 100.0 grams of Hydrogen burns, how many moles of Water will form?
1 answer:
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:
c = 0.377 J/g.°C
c = 0.2350 J/g.°C
J = 27.3 J
Explanation:
We can calculate the heat (Q) absorbed or released by a substance using the following expression.
Q = c × m × ΔT
where,
c: specific heat
m: mass
ΔT: change in the temperature
<em>It takes 49.0J to raise the temperature of an 11.5g piece of unknown metal from 13.0°C to 24.3°C. What is the specific heat for the metal? Express your answer numerically, in J/g.°C</em>
Q = c × m × ΔT
49.0 J = c × 11.5 g × (24.3°C - 13.0°C)
c = 0.377 J/g.°C
<em>The molar heat capacity of silver is 25.35 J/mol.°C. How much energy would it take to raise the temperature of 11.5g of silver by 10.1°C? Express your answer numerically, in Joules. What is the specific heat of silver?</em>
<em />
The molar mass of silver is 107.87 g/mol. The specific heat of silver is:
Q = c × m × ΔT
Q = (0.2350 J/g.°C) × 11.5 g × 10.1°C = 27.3 J
Answer:
Latent heat of fusion of the substance is
Explanation:
Latent heat of fusion denotes amount of energy (heat) per unit mass required to melt a solid material at constant temperature and pressure i.e. at it's melting point
Here amount of heat required =
Mass of unknown substance being melted = 18.5 kg
So, latent heat of fusion of the substance = (required heat energy to melt)/(mass of the unknown substance) =
So, latent heat of fusion of the substance is