Don’t have a calculator on me but multiply 6.02x10 to the 23rd power by 4.5
Answer:
a)
b)
c)
d)
Explanation:
The reaction is:
Cr₂O₃(s) + 2Al(s) → 2Cr(s) + Al₂O₃(s)
a) To find the Al mass needed to react with 50 g of Cr₂O₃, we need to calculate the number of moles of Cr₂O₃:
Where:
: is the mass = 50 g
: is the molar mass = 2*52+3*16 = 152 g/mol
Now, the estoichiometric relation between Cr₂O₃ and Al is 1:2, so:
Hence, the mass of Al is:
b) The stoichiometric relation from Cr₂O₃ and Cr is 1:2, hence:
Thus, the mass of Cr is:
c) The number of moles of Cr₂O₃ with a mass of 5 kg is:
So, the mass of Cr is:
d) The mass of Cr produced from 5 tonnes of Cr₂O₃ is:
I hope it helps you!
Proton is a nucleon with a positive charge in the center of the atom, neutrons are nucleons which are also in the nucleus, or center of the atom and have no charge. Both protons and neutrons have a mass of 1 atomic mass unit (amu). Electrons are negatively charged and orbit the nucleus and have a mass of 1/1836 amu which is much less then the nucleons
Answer:
1.75 g
Explanation:
as density ×volume =mass
3.5×0.5=mass
mass=1.75 g
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false..When two hydrogen bonds they create Molecule