Answer:
Carbon or the symbol C has a mass percentage of 42.880% while Oxygen or symbol O has a mass percentage of 57.120%
It’s the nerves but I’m not 100% sure if I’m correct
Answer:
all elements have a different atomic number
Explanation:
Atomic number of element does not affect their reactions with others
Answer:
280 mL
Explanation:
Given data:
Mass of CuSO₄ = 55.75 g
Molarity of CuSO₄ = 1.25 M
Volume of CuSO₄ = ?
Solution:
First of all we will calculate the number of moles.
Number of moles:
Number of moles = mass / molar mass
Number of moles = 55.75 g/ 159.6 g/mol
Number of moles = 0.35 mol
Volume of CuSO₄:
Molarity = number of moles / volume in litter
1.25 M = 0.35 mol / volume in litter
Volume in litter = 0.35 mol / 1.25 M
Volume in litter = 0.28 L
Volume in milliliter:
0.28 L × 1000 mL/ 1 L = 280 mL
Answer:
ΔPV = -9911 J
Explanation:
The combustion of 1 mole of heptane is:
C₇H₁₆(l) + 11O₂(g) → 7CO₂(g) + 8H₂O(l)
The change in number of moles of gas molecules is:
Δn = 7 moles products - 11 moles reactants = -<em>4 moles</em>
Using ideal gas ΔPV is:
ΔPV = ΔnRT
Where:
Δn is -4mol
R is 8,314472 J/molK
T is 298K
Replacing:
<em>ΔPV = -9911 J</em>
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I hope it helps!
