1 mole = 70.9
X mole = 140
X=1.9746 moles
X= 1.98 when rounded to 3 significant figures.
No, Aluminum foil opaque not translucent.
Answer : The number of moles of ions form are, and there are 3 ions formed.
Explanation :
First we have to calculate the moles of calcium iodide.
Molar mass of calcium iodide = 293.9 g/mol
Mass of calcium iodide = 51.0 g
Now we have to calculate the number of moles of ions.
As we know that when calcium iodide dissolved in water then it dissocites to give calcium ion and iodide ion.
The balanced chemical reaction will be:
From this we conclude that there are 3 ions formed.
As, 1 mole of calcium iodide dissociate to give number of ions
So, 0.174 mole of calcium iodide dissociate to give number of ions
Thus, the number of moles of ions form are,
Answer:
The answer to your question is 1.2 moles of copper
Explanation:
Data
mass of copper = 75 g
moles = ?
Process
1.- Look in the periodic table for the atomic mass of copper.
Atomic mass = 63.55 g/mol
2.- Use proportions to determine the moles of copper in 75 g
63.55 g of copper -------------------- 1 mol
75 g of copper -------------------- x
Use cross multiplication
x = (75 x 1) / 63.55
x = 75 / 63.55
x = 1.18 moles ≈ 1.2 moles of copper
The particles are no longer held together by the attractive forces keeping it a liquid (hydrogen bonds in the case of water). Enough energy has to be put into the system to break these bonds. When this happens the particles pull apart and fill the space available as a gas