We use soil, water, and air everyday
There is ten over all I believe.
a puddle evaporating = physical change
adding food coloring to water = chemical change
cutting an apple = physical change
denting a piece of metal = physical change
dry ice sublimating = I think is chemical change
iron rusting = chemical change
limewater and carbon dioxide forming chalk = chemical change
water boiling = physical change
vinegar and baking soda making bubbles = chemical change
paper burning = chemical change
Your welcome. I do sincerely believe that these are correct.
Answer: 35.4 grams
Explanation:
Molarity of a solution 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,
Molality = 2.65
n= moles of solute =?
= volume of solution in ml = 445 ml
Putting in the values we get:
![2.65=\frac{n\times 1000}{445ml}](https://tex.z-dn.net/?f=2.65%3D%5Cfrac%7Bn%5Ctimes%201000%7D%7B445ml%7D)
![n=1.18](https://tex.z-dn.net/?f=n%3D1.18)
Mass of solute in g=![moles\times {\text {molar mass}}=1.18mol\times 30.02g/mol=35.4g](https://tex.z-dn.net/?f=moles%5Ctimes%20%7B%5Ctext%20%7Bmolar%20mass%7D%7D%3D1.18mol%5Ctimes%2030.02g%2Fmol%3D35.4g)
Thus 35.4 grams of
is needed to prepare 445 ml of a 2.65 m solution of
.
Answer:
DONT PRESS THAT THAT IS HACK AND VIRUS
Explanation: