Answer:
FeS + O2 - Fe,02 + SO2
Explanation:
You have to see that no of Atoms are equal on both sides or not.
FeS + O2 - Fe,02 + SO2
Ferrous is balanced on both sides and also sulphur but oxygen is not balanced .
Ino left side oxygen is 2 while on right it's 4.
So, we have to balanced Oxygen.
FeS + 2O2 - Fe,02 + SO2
Now see it's balanced (we insert 2 on left side to balance the oxygen)
The answer is (2) 12mL. The reaction equation is NaOH + HCl = NaCl + H2O. So the mol number of NaOH is equal to HCl. The concentration of NaOH is twice of HCl so the volume of HCl is twice of NaOH.
PV = nRT (where P = pressure; V = volume; n = number of moles; R = gas constant; T = Temperature)
Moles of H₂ = mass of H₂ ÷ molar mass of H₂
= 6.0 g ÷ 2 g/mol
= 3.0 mol
To get the answer in atmospheres, let's convert C to K
25 °C ≡ 298 K
Now, based on the formula above
P = (nRT) ÷ V
P = (3.0 mol × (0.082 L · atm/mol · K) × 298 K) ÷ 73 L
≈ 1 .004 atm
2 hydrogen atoms hope this helps
Answer:
The element argon is in column 8A and is a noble gas. Nobles gases are completely stable because their outershell is filled with all eight electrons. Argon has eight valence electrons.
