Hello!
Here from the unbalanced reaction we can balance it by comparing the reactants and products(Left hand side versus Right hand side). We can see one carbon and two oxygen on the left hand side, but then we have two carbon and only 1 oxygen on the rhs. This goes against matter or energy can be neither created or destroyed so we have to balance it first to compare mole to mole relationships. So we can simply right in the the missing elements and balance like this:
SiO2(s) + 2C(s) —-> SiC(s) + C02(g)
Now from the balanced reaction we can see it takes 2 moles of Carbon to make only 1 mole of SiC. So if we are given the amount of moles Of SiC produced, then we can see from the 2:1 Ratio of Carbon:SiC that we need double the amount of Carbon to produce 1mole of SiC(s) since the Carbon used is making SiC(s) and CO2(g). Therefore we would need 5moles of Carbon to start with, in order to make 2.5mole of SiC and CO2 from the reaction given above.
Hope this helps. Any questions please feel free to ask. Thank you kindly!
Answer:
a
Explanation:
I hope God it has to be 20 characters so here but I hope this right please have a god day
Answer:
Hey kimalonzo59!
· Calculate specific heat as c = Q / (mΔT). In our example, it will be equal to c = -63,000 J / (5 kg * -3 K) = 4,200 J/ (kg·K). This is the typical heat capacity of water.
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Answer:
a) Mo the electron configuration: 42Mo: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d4
Mo3+ - is Paramagnetic
b) Au - [Xe] 4f14 5d10 6s1
For Au+ is not paramagnetic
c) Mn - [Ar] 3d5 4s2
Mn2+ is paramagnetic
d)Hf -[Xe] 4f¹⁴ 5d² 6s²
Hf2+ is not paramagnetic
Explanation:
An atom becomes positively charged when it looses an electron.
Diamagnetism in atom occurs whenever two electrons in an orbital paired equalises with a total spin of 0.
Paramagnetism in atom occurs whenever at least one orbital of an atom has a net spin of electron. That is a paramagnetic electron is just an unpaired electron in the atom.
Here is a twist even if an atom have ten diamagnetic electrons, the presence of at least one paramagnetic electron, makes it to be considered as a paramagnetic atom.
Simply put paramagnetic elements are one that have unpaired electrons, whereas diamagnetic elements do have paired electron.
