Answer: 14.62 ml
Explanation:
Molarity is defined as the number of moles of solute dissolved per liter of the solution.
![Molarity=\frac{n\times 1000}{V_s}](https://tex.z-dn.net/?f=Molarity%3D%5Cfrac%7Bn%5Ctimes%201000%7D%7BV_s%7D)
where,
n= moles of solute
= volume of solution in ml = 250 ml
![{\text {moles of solute}=\frac{\text {given mass}}{\text {molar mass}}=\frac{0.09666g}{98g/mol}=9.9\times 10^{-4}](https://tex.z-dn.net/?f=%7B%5Ctext%20%7Bmoles%20of%20solute%7D%3D%5Cfrac%7B%5Ctext%20%7Bgiven%20mass%7D%7D%7B%5Ctext%20%7Bmolar%20mass%7D%7D%3D%5Cfrac%7B0.09666g%7D%7B98g%2Fmol%7D%3D9.9%5Ctimes%2010%5E%7B-4%7D)
Now put all the given values in the formula of molarity, we get
![Molarity=\frac{9.9\times 10^{-4}\times 1000}{250ml}](https://tex.z-dn.net/?f=Molarity%3D%5Cfrac%7B9.9%5Ctimes%2010%5E%7B-4%7D%5Ctimes%201000%7D%7B250ml%7D)
![Molarity=3.9\times 10^{-3}M](https://tex.z-dn.net/?f=Molarity%3D3.9%5Ctimes%2010%5E%7B-3%7DM)
To calculate the volume of base, we use the equation given by neutralization reaction:
![n_1M_1V_1=n_2M_2V_2](https://tex.z-dn.net/?f=n_1M_1V_1%3Dn_2M_2V_2)
where,
are the n-factor, molarity and volume of acid which is ![H_3PO_4](https://tex.z-dn.net/?f=H_3PO_4)
are the n-factor, molarity and volume of base which is NaOH.
We are given:
![n_1=3\\M_1=3.9\times 10^{-3}M\\V_1=250mL\\n_2=1\\M_2=0.2000M\\V_2=?](https://tex.z-dn.net/?f=n_1%3D3%5C%5CM_1%3D3.9%5Ctimes%2010%5E%7B-3%7DM%5C%5CV_1%3D250mL%5C%5Cn_2%3D1%5C%5CM_2%3D0.2000M%5C%5CV_2%3D%3F)
Putting values in above equation, we get:
![3\times 3.9\times 10^{-3}\times 250=1\times 0.2000\times V_2\\\\V_2=14.62ml](https://tex.z-dn.net/?f=3%5Ctimes%203.9%5Ctimes%2010%5E%7B-3%7D%5Ctimes%20250%3D1%5Ctimes%200.2000%5Ctimes%20V_2%5C%5C%5C%5CV_2%3D14.62ml)
Thus the volume of NaOH solution the student will need to add to reach the final equivalence point is 14.62 ml
Answer:
B
Explanation:
Because elements cannot be further broken down by chemicals.
Answer:
left, increase
Explanation:
If oxygen gas is removed from the system, then the equilibrium will shift to the __left_____ and the amount of NH3 gas will _increase________.
<span>The balanced chemical ionic equarion of MgS(aq)+CuCl2(aq) = CuS(s)+MgCl2(aq) would be as follows:
</span><span>Mg2+ + S2- + Cu 2+ + 2 Cl- ==> CuS + Mg2+ + 2 Cl-
Therefore, the net equation would be:
</span><span>Cu 2+ + S 2- ===> CuS
</span><span>
Hope this helps.
</span>
If you start with the mass of a substance, divide it by its molar mass to find the number of moles of the substance. Then, multiply the number of moles by Avogadro's number, 6.022*10^23, which gives the number of particles per mole of a substance.
Example:
Find the number of atoms in 10 g of CO2.
The mass of a single mole of CO2 is 54 g/mol. You can get this value by adding up the molar masses of the atoms in CO2(12+16+16).
Then divide 10 g by 54 g/mol to get the number of moles of CO2 in 10 g, which is 0.19 mol.
Finally, multiply 0.19 by Avogadro's number to get 1.1*10^23 molecules of CO2.