HELP QUICKLY PLEASE!!! Thermal energy is transferred from a hot object to a colder object by means of ___
1 answer:
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Answer:
The answer is
<h2>0.4 g/cm³</h2>Explanation:
The density of a substance can be found by using the formula
From the question
mass of wood = 120 g
volume = 300 cm³
So the density of the wood is
We have the final answer as
<h3>0.4 g/cm³</h3>Hope this helps you
Answer : 0.8663 Kg of chalcopyrite must be mined to obtained 300 g of pure Cu.
Solution : Given,
Mass of Cu = 300 g
Molar mass of Cu = 63.546 g/mole
Molar mass of = 183.511 g/mole
- First we have to calculate the moles of Cu.
The moles of Cu = 4.7209 moles
From the given chemical formula, we conclude that the each mole of compound contain one mole of Cu.
So, The moles of Cu = Moles of = 4.4209 moles
- Now we have to calculate the mass of
.
Mass of = Moles of
× Molar mass of
= 4.4209 moles × 183.511 g/mole = 866.337 g
Mass of = 866.337 g = 0.8663 Kg (1 Kg = 1000 g)
Therefore, 0.8663 Kg of chalcopyrite must be mined to obtained 300 g of pure Cu.