The balanced reaction is:
<span>4Cr(s)+3O2 (g )= Cr2O3 (s)
Since we are not given the amount of any of the reactants, we assume we have one gram of chromium. Calculations are as follows:
1 g Cr ( 1 mol Cr / 52 g Cr ) ( 1 mol Cr2O3 / 4 mol Cr ) = <span>0.005 mol Cr2O3
</span></span>0.005 mol Cr2O3 (151.99 g Cr2O3 / 1 mol Cr2O3 ) = 0.7307 g <span>Cr2O3
</span>
Therefore, the theoretical yield for 1 gram of Cr is 0.005 mol Cr2O3 or 0.7307 g Cr2O3.
Physical change because the matter in the object is not chemically changing
Answer:
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Explanation:
Answer:
<em><u>A. any absorbance of light by the solvent AND the cuvette needs to be accounted for</u></em>
Explanation:
Blank calibrations are usually carried out on the spectrometer to eliminate and account for any readings that would come from absorptions of the curvette, solvents/reagents or anything that is not the main analyte we are testing for.
Hence the blank solution does not contain the analyte itself. Fingerprints should be removed from the curvette as practice. Hence the most suitable answer amongst the options is A.
I hope this was clear ad most of all, helpful.
Answer:
Options: 1, 2, 3 and 5 are correct
Explanation:
- As per the Aufbau priciple, electrons go into the subshell having the most minimal conceivable energy.
- By Hund's standard, the electron arrangement of carbon, which is , in this manner the carbon particle contains two unpaired electrons.
- Electrons can never have parallel turn in s-orbitals. If there should be an occurrence of Helium, it has 2 electrons with parallel turn in its 1s orbital.
- The plan of the orbitals in a multi electron molecule is not quite the same as the course of action in a solitary electron particle inferable from the electron-electron shocks in a multi electron iota.
- In the Li particle, the 3s, 3p, and 3d orbitals have various energies.
- Helium has 2 electrons during the 1s orbital and none during the 2s.