It’s ether B or D I think it’s B tho
Answer: The percent yield of lithium chloride if a reaction starts with 20.0 g lithium hydroxide and yields 6.00 g lithium chloride is 17.2 %
Explanation:
The balanced chemical reaction is
![LiOH+KCl\rightarrow LiCl+KOH](https://tex.z-dn.net/?f=LiOH%2BKCl%5Crightarrow%20LiCl%2BKOH)
To calculate the moles, we use the equation:
![\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}](https://tex.z-dn.net/?f=%5Ctext%7BNumber%20of%20moles%7D%3D%5Cfrac%7B%5Ctext%7BGiven%20mass%7D%7D%7B%5Ctext%20%7BMolar%20mass%7D%7D)
a) moles of ![LiOH](https://tex.z-dn.net/?f=LiOH)
![\text{Number of moles}=\frac{20.0g}{24g/mol}=0.83moles](https://tex.z-dn.net/?f=%5Ctext%7BNumber%20of%20moles%7D%3D%5Cfrac%7B20.0g%7D%7B24g%2Fmol%7D%3D0.83moles)
b) moles of ![LiCl](https://tex.z-dn.net/?f=LiCl)
![\text{Number of moles}=\frac{6.00g}{42g/mol}=0.14moles](https://tex.z-dn.net/?f=%5Ctext%7BNumber%20of%20moles%7D%3D%5Cfrac%7B6.00g%7D%7B42g%2Fmol%7D%3D0.14moles)
According to stoichiometry :
1 mole of
produces = 1 mole of ![LiCl](https://tex.z-dn.net/?f=LiCl)
Thus 0.83 moles of
produce=
of ![LiCl](https://tex.z-dn.net/?f=LiCl)
Mass of ![LiCl=moles\times {\text {Molar mass}}=0.83moles\times 42g/mol=34.9g](https://tex.z-dn.net/?f=LiCl%3Dmoles%5Ctimes%20%7B%5Ctext%20%7BMolar%20mass%7D%7D%3D0.83moles%5Ctimes%2042g%2Fmol%3D34.9g)
The theoretical yield of
= 34.9 g
The experimental yield of ethanol = 6.00 g
Now we have to calculate the percent yield of ethanol.
![\%\text{ yield}=\frac{\text{Actual yield}}{\text{Theoretical yield}}\times 100=\frac{6.00g}{34.9g}\times 100=17.2\%](https://tex.z-dn.net/?f=%5C%25%5Ctext%7B%20yield%7D%3D%5Cfrac%7B%5Ctext%7BActual%20yield%7D%7D%7B%5Ctext%7BTheoretical%20yield%7D%7D%5Ctimes%20100%3D%5Cfrac%7B6.00g%7D%7B34.9g%7D%5Ctimes%20100%3D17.2%5C%25)
Therefore, the percent yield is, 17.2 %
D: Schizophrenia. The individual that’s diagnoses with Schizophrenia tends to be disconnected with reality, leading to breakdowns in the world around them. A man sees a crowd of screaming, aggressive ghosts when it’s only a crowd of people waiting for a bus.
Answer: 82.0 g/mole
Explanation:
Use the units to see that if we divide 1.64 grams by 0.0200 moles, we'll get a number that is grams/mole, the definition of formula mass.
1.64/0.0200 = 82.0 g/mole (3 sig figs)
We can't tell from this alone what the molecular formula might be, but C6H10 (cyclohexene) comes close (82.1 grams/mole).