I believe the correct answer is option B. Molarity is the <span>number of moles of solute that is dissolved in 1 liter of solution. It is another way of expressing concentration of a mixture especially for solutions. Percent by mass is grams solute per grams of solution. Percent by volume is liter solute per liter per solution.</span>
An alloy is a mixture of two or more metals which is produced with a specific proportion between metals. So, if the proportion is changed the physical characteristic would be changed as well. For example, brass musical instruments are made of brass which is a mixture (an alloy) of zinc and copper in a specific proportion. If you change a proportion, you will change the physical characteristic of brass musical instruments, and a sound they produce will be different.
<span>Double displacement reaction is your answer.</span>
Answer:
9.35g
Explanation:
The molarity equation establishes that:
![\textrm{molarity}=\frac{\textrm{moles of solute}}{\textrm{liters of solution}}](https://tex.z-dn.net/?f=%5Ctextrm%7Bmolarity%7D%3D%5Cfrac%7B%5Ctextrm%7Bmoles%20%20of%20solute%7D%7D%7B%5Ctextrm%7Bliters%20of%20solution%7D%7D)
So, we have information about molarity (2M) and volume (80 ml=0.08 l), with that, we can find the moles of solute:
![\textrm{moles of solute}=\textrm{molarity}*\textrm{liters of solution}](https://tex.z-dn.net/?f=%5Ctextrm%7Bmoles%20of%20solute%7D%3D%5Ctextrm%7Bmolarity%7D%2A%5Ctextrm%7Bliters%20of%20solution%7D)
![\textrm{moles of solute}= 0.08 \textrm{ l} *2\textrm{ M} = 0.16 \textrm{ mol}](https://tex.z-dn.net/?f=%5Ctextrm%7Bmoles%20of%20solute%7D%3D%200.08%20%5Ctextrm%7B%20l%7D%20%2A2%5Ctextrm%7B%20M%7D%20%3D%200.16%20%5Ctextrm%7B%20mol%7D)
The mathematical equation that establishes the relationship between molar weight, mass and moles is:
![\textrm{molar weight}= \frac{\textrm{mass}}{\textrm{moles}}](https://tex.z-dn.net/?f=%5Ctextrm%7Bmolar%20weight%7D%3D%20%5Cfrac%7B%5Ctextrm%7Bmass%7D%7D%7B%5Ctextrm%7Bmoles%7D%7D)
![\textrm{MW}= \frac{\textrm{m}}{\textrm{n}}](https://tex.z-dn.net/?f=%5Ctextrm%7BMW%7D%3D%20%5Cfrac%7B%5Ctextrm%7Bm%7D%7D%7B%5Ctextrm%7Bn%7D%7D)
We have MW (58.44g/mole) and n (0.16 mol), and we need to find m (grams of salt needed) to solve the problem:
![\textrm{m} = \textrm{MW * n}= 58.44\frac{\textrm{g}}{\textrm{mol}} * 0.16 \textrm{ mol} = 9.35 \textrm{ g}](https://tex.z-dn.net/?f=%5Ctextrm%7Bm%7D%20%3D%20%5Ctextrm%7BMW%20%2A%20n%7D%3D%2058.44%5Cfrac%7B%5Ctextrm%7Bg%7D%7D%7B%5Ctextrm%7Bmol%7D%7D%20%2A%200.16%20%5Ctextrm%7B%20mol%7D%20%3D%209.35%20%5Ctextrm%7B%20g%7D)
The equation is balanced as follows
Mgcl2 +2AgNo3 -->2Agcl +Mg(No3)2
from equation above 1 mole of MgCl2 reacted with 2 moles of AgNo3 to form 2 moles of AgCl2 and 1 mole of Mg(NO3)2
when balancing equation the number of atom of element should be the same on each side of equation.