In the compound Co2O3, cobalt has an oxidation number of 3, while oxygen's oxidation number is -2.
An oxidation number is a number assigned to an element in chemical combination that represents the number of electrons lost (or gained, if the number is negative) by an atom of that element in the compound.
Aw, I hope I can help.
1) C
(A meter stick is the only form of measurement that measures distance)
2) C
(other metric units all correspond with other forms of measurement)
3/4) I can’t measure the line physically from my phone but I think you’d be alright!
5) B
(a triple beam balance measures mass!)
6) B
(corresponds with triple beam balance)
7) A: 34.5g B: 104.3g C: 132.5g
8) C
9) A
(a graduated cylinder is the only form of measurement that measures volume)
10) A
(corresponds with a graduated cylinder!)
Answer:
π = 4.1 atm
Explanation:
We can calculate the osmotic pressure exerted by a solution using the following expression.
π = M . R . T
where,
π is the osmotic pressure
M is the molar concentration of the solution
R is the ideal gas constant
T is the absolute temperature
The absolute temperature is 37 + 273 = 310 K
π = M . R . T
π = (0.16 mol/L) . (0.082atm.L/mol.K) . 310 K = 4.1 atm
Element Symbol Mass Percent
Sodium Na 27.367%
