Answer:
12.2 g
Explanation:
Step 1: Given data
Mass of O in KClO₄: 5.62 g
Step 2: Calculate the moles corresponding to 5.62 g of O
The molar mass of O is 16.00 g/mol.
5.62 g × (1 mol/16.00 g) = 0.351 mol
Step 3: Calculate the moles of KClO₄ that contain 0.351 moles of O
The molar ratio of KClO₄ to O is 1:4. The moles of KClO₄ that contain 0.351 mol of O are 1/4 × 0.351 mol = 0.0878 mol
Step 4: Calculate the mass corresponding to 0.0878 moles of KClO₄
The molar mass of KClO₄ is 138.55 g/mol.
0.0878 mol × (138.55 g/mol) = 12.2 g
<span>Calcium magnesium potassium and sodium are all electrolytes - TRUE</span>
Answer:
A- how long ago a plant or animal lived
Answer:
mass of CO2 = 20.9 g
Explanation:
Given that:
mass of O2= 30.4 g
molar mass O2 = 32
number of moles of O2 = 30.4 / 32
number of moles of O2 = 0.95 moles
The Volume of O2 = 2V
Using ideal gas equation:
PV = nRT
P × (2V) = 0.95 × R × T
PV = 0.475 RT ----- (1)
For CO2;
The volume = V
Using ideal gas equation:
PV = nRT ---- (2)
Equating equation (1) and (2) together, we get:
0.475 RT = nRT
Dividing both sides by RT
(0.475 RT)/RT = (nRT)/RT
0.475 = n
Thus, the number of moles of CO2 = 0.475
Since mass = number of moles × molar mass
mass of CO2 = 0.475 × 44
mass of CO2 = 20.9 g
It is seen that in first and third ones elements are not changed but only their chemical arrangements are changed. both are chemical reactions.
In the second and last one elements are changed after the reaction and as we know non chemical reactions are not capable of doing that so they are nuclear reactions.
There are other ways to tell like checking number of neutrons as well but in this simple case I don't think it is necessary to check those.
Good luck!