<span>A. the sum of the protons and neutrons in one atom of the element</span>
Answer:
2Na + F2 → 2NaF
Explanation:
A balanced equation is an equation in which the number of the individual atoms on the left side is the same with that on the right side of the equation. This is true as explained by the law of conservation of matter.
From the options above only the equation given below is balanced :
2Na + F2 → 2NaF
There are 2 atoms of Na both on the left and on the right. There are also 2 atoms of F both on the left and right side
Answer: 0.05
Explanation:Divide the length (1.5 cm) by the number of turns (30)
A. solutions and colloids
Answer: a) 0.06 M
b) 3.13 grams.
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.
![Molarity=\frac{moles}{\text {Volume in L}}](https://tex.z-dn.net/?f=Molarity%3D%5Cfrac%7Bmoles%7D%7B%5Ctext%20%7BVolume%20in%20L%7D%7D)
Moles of ![Cl^-=Molarity\times {\text {Volume in L}}=0.240\times 0.2L=0.048moles](https://tex.z-dn.net/?f=Cl%5E-%3DMolarity%5Ctimes%20%7B%5Ctext%20%7BVolume%20in%20L%7D%7D%3D0.240%5Ctimes%200.2L%3D0.048moles)
The balanced reaction for dissociation will be:
![SnCl_4\rightarrow Sn^{4+}+4Cl^{-}](https://tex.z-dn.net/?f=SnCl_4%5Crightarrow%20Sn%5E%7B4%2B%7D%2B4Cl%5E%7B-%7D)
Thus for 4 moles of
, there is 1 mole of ![SnCl_4](https://tex.z-dn.net/?f=SnCl_4)
Thus moles of ![SnCl_4=\frac{1}{4}\times 0.048=0.012](https://tex.z-dn.net/?f=SnCl_4%3D%5Cfrac%7B1%7D%7B4%7D%5Ctimes%200.048%3D0.012)
Molarity of ![SnCl_4=\frac{moles}{\text {Volume in L}}=\frac{0.012}{0.2L}=0.06M](https://tex.z-dn.net/?f=SnCl_4%3D%5Cfrac%7Bmoles%7D%7B%5Ctext%20%7BVolume%20in%20L%7D%7D%3D%5Cfrac%7B0.012%7D%7B0.2L%7D%3D0.06M)
Thus the molarity of the
solution = 0.06 M
b) Mass of
= ![moles\times {\text {Molar mass}}=0.012mol\times 260.522g/mol=3.13g](https://tex.z-dn.net/?f=moles%5Ctimes%20%7B%5Ctext%20%7BMolar%20mass%7D%7D%3D0.012mol%5Ctimes%20260.522g%2Fmol%3D3.13g)
Thus mass of
Wenzhou use is 3.13 grams.