Answer:
Mass ratio: 71:112
Atomic ratio: 2:7
Explanation:
1. To get the mass ratio of of the compound Cl2O7, the following steps are followed:
- The atomic mass of Cl = 35.5g/mol, O = 16g/mol
- The mass of each element in the compound is as follows:
Cl2 = 35.5(2) = 71g
O7 = 16(7) = 112g
The mass ratio is the ratio of one mass of an element to another in the compound, hence, the mass ratio is 71:112
- The molar mass of the compound, Cl2O7, is determined:
71 + 112 = 183g/mol
- The mass percent of each element is determined by dividing the mass of each element present by the Molar Mass:
Cl = 71/183 = 0.3879 × 100 = 38.8%
O = 112/183 = 0.612 × 100 = 61.2%
2. Atomic ratio is the ratio of one atom in a molecule to another. It can be calculated this:
In Cl2O7, there are 9 total atoms (2 atoms of Cl + 7 atoms of oxygen).
Hence, that atomic ratio of Cl to oxygen in Cl2O7 is 2:7
Answer:
3.5 x 10^22 moles of carbon are there in a 0.70 g (3.5 carat) diamond.
Explanation:
In case of diamond, the number of atoms is the same as the number of molecules.
Answer:
ΔH of dissociation is 38,0 kJ/mol
Explanation:
The dissociation reaction of KBrO₃ is:
<em>KBrO₃ → K⁺ + BrO₃⁻ </em>
This dissolution consume heat that is evidenced with the decrease in water temperature.
The heat consumed is:
q = CΔTm
Where C is specific heat of water (4,186 J/mol°C)
ΔT is the temperature changing (18,0°C - 13,0°C = 5,0°C)
And m is mass of water (150,0 mL ≈ 150,0 g)
Replacing, heat consumed is:
q = 3139,5 J ≡ 3,14 kJ
13,8 g of KBrO₃ are:
13,8 g×(1mol/167g) = 0,0826 moles
Thus, ΔH of dissociation is:
3,14kJ / 0,0826mol = <em>38,0 kJ/mol</em>
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I hope it helps!
