Answer:
Se⁻²
Explanation:
Even though the atom is not shown, we can consult the periodic table. Selenium (Se) is in group 6 and period 4, so it has 6 valence electrons. To be stable, the atom must have a noble gas configuration with 8 valence electrons, thus, selenium must gain 2 electrons.
When an atom gain electrons, it is negatively charged, because electrons have a negative charge. So, the ion formed is Se⁻².
Answer: 0.297 moles of calcium carbonate.
Solution:
Number of moles of HCl = moles
According to reaction
Two moles of HCl are reacting with one mole of , then 0.6 moles of HCl will react with:
=
Moles of calcium carbonate reacted = 0.3 moles
In 0.3 moles of calcium carbonate 10% impurities is present i.e.
of impurity.
Actual number of moles of calcium carbonate reacted = 0.3 - 0.003 = 0.297 moles.
Molecules move from areas of low concentration to areas of high concentration. This requires the use of energy.
Answer:
Partial pressure of ICl at equilibrium is 1.69 atm
Partial pressure of chloride gas at equilibrium is 0.00631 atm.
Partial pressure of iodine gas at equilibrium is 0.00631 atm.
Explanation:
The partial pressure of ICl initially = 1.70 atm
The equilibrium constant of the reaction =
Initially
1.70 atm 0 0
At equilibrium
(1.70-2p) p p
The expression of equilibrium constant is given by :
Solving for p :
p = 0.00631 atm
Partial pressure of ICl at equilibrium = 1.70 atm- 2 0.00631 atm = 1.69 atm
Partial pressure of chloride gas at equilibrium = 0.00631 atm.
Partial pressure of iodine gas at equilibrium = 0.00631 atm.