2 atoms of potassium and 1 atom of oxygen
Answer:
27.22dm³
Explanation:
Given parameters:
number of moles = 1 mole
temperature = 50°C, in K gives 50+273 =323K
Pressure = 98.6kpa in atm, gives 0.973atm
Unknown:
Volume of the gas = ?
Solution:
Since the unknown is the volume of gas, applying the ideal gas law will be appropriate in solving this problem.
The ideal gas law is mathematically expressed as;
Pv = nRT
where P is the pressure of the gas
V is the volume
n is the number of moles
R is the gas constant
T is the temperature
Input the parameters and solve for V;
0.973 x V = 1 x 0.082 x 323
V = 27.22dm³
We can use the ideal gas equation to determine the temperature with the given conditions of mass of the gas, volume, and pressure. The equation is expressed
PV=nRT where n is the number of moles equal to mass / molar mass of gas. Substituting the given conditions with R = 0.0521 L atm/mol K we can find the temperature
Ca + 2HCl = CaCl₂ + H₂
c=4.50 mol/l
v=2.20 l
n(HCl)=cv
m(Ca)/M(Ca)=n(HCl)/2
m(Ca)=M(Ca)cv/2
m(Ca)=40g/mol·4.50mol/l·2.20l/2=198 g
198 grams of Ca are needed