Answer:
10.56g
Explanation:
From the reaction equation, we can see that it is unbalanced. In the balanced state, 2 moles of KClO3 will yield 3 moles oxygen.
Let's calculate the actual number of moles now. We first divide the mass of the KClO3 by the molar mass. Molar mass of KClO3 = 39 + 35.5 + 3(16) = 122.5g/mol
The number of moles is thus 26.4/122.5 = 0.22 mole
If 2 moles KClO3 gave 3 moles O2, this means 0.22 moles will give (0.22 × 3)/2 = 0.33 mole
To calculate the mass of oxygen formed, we multiply the molecular mass of oxygen molecule by the number of moles
The molecular mass of oxygen molecule = 16 × 2 = 32g/mol
The mass formed = 32 × 0.33 = 10.56g
Answer:
Explanation:
density = mass / volume
mass = 17.95 grams
volume = 17.97 - 15.50 mL = 2.45 mL = 2.45 cc
density = 17.95 /(2.45) = 7.327 grams / cc
In an endothermic reaction, “delta H” is always positive, since the system is absorbing heat from its surroundings, not releasing into the surroundings like in an exothermic reaction where the delta H is always negative.
So our endothermic reactions would be the first (484kJ) and the last (92kJ).
Answer:
you mean KI? kI potassium K must be a uppercase.
Explanation:
<h2>CuSO4 + KI = CuI + I2 + K2SO4</h2>
Thats what happened.
CuI is insoluble is water.So Its a precipitation.I2 (iodine) is purple gas...
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