8. An ion with 5 protons, 6 neutrons, and a charge of 3+ has an
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Answer : Mass of copper (Cu) metal obtained = 556.281 g
Solution : Given,
Mass of copper ore = 1 Kg = 1000 g
From the periodic table, the molar mass of copper and copper ore are
Molar mass of copper = 63.546 g/mole
Molar mass of copper ore, = 342.678 g/mole
First we have to calculate the number of moles of copper ore,
Moles of =
=
= 2.918 moles
The balanced chemical reaction is :
From this chemical reaction, we conclude that
2 moles of gives → 6 moles of Cu
2.918 moles of gives →
= 8.754 moles
Thus, the Moles of copper (Cu) = 8.754 moles
Now, calculate the Mass of copper (Cu).
Mass of copper (Cu) = Moles of copper (Cu) × Molar mass of copper (Cu)
= 8.757 moles × 63.546 g/moles
= 556.281 g
Answer:
Time = t = 30.01 minutes
Explanation:
The missing part of the question is that "The water heater power rating is 255 Watts, where 1 Watt = 1 J/s.
Firstly, calculating the work done by water heater to heat 5.5 L of water from 23° C to 43°C.
Work Done = Q = m C ΔT
where,
Q = Heat Transfer
m = mass of water
m = Density x Volume = 1 g/mL x 5.5 L = 1000g/L x 5.5L = 5500 g
ΔT = Temperature Difference = 43-23 = 20°C
C = Heat Capacity of Water = 4.186 J/g °C
Therefore,
Since, Power can be given as Work done per unit time,
or, in this case,
Here,
P = 255W or P = 255J (Since 1W = 1J)