Boyles law states P1V1=P2V2
P being pressure and V being volume
So volume and pressure
Answer:
Mass = 3 g
Explanation:
Given data:
Mass of magnesium = 2.4 g
Mass of oxygen = 2.4 g
Mass of magnesium oxide formed = ?
Solution:
Chemical equation;
2Mg + O₂ → 2MgO
Number of moles of oxygen:
Number of moles = mass / molar mass
Number of moles = 2.4 g/ 32 g/mol
Number of moles = 0.075 mol
Number of moles of magnesium:
Number of moles = mass / molar mass
Number of moles = 2.4 g/ 24 g/mol
Number of moles = 0.1 mol
now we will compare the moles of magnesium oxide with both reactant.
Mg : MgO
2 : 2
0.075 : 0.075
O₂ : MgO
1 : 2
0.1 : 2/1×0.1 = 0.2
Mass of magnesium oxide:
Mass = number of moles × molar mass
Mass = 0.075 mol × 40 g/mol
Mass = 3 g
A buffer is usually composed of either:
- a weak base combined with its conjugate acid, or
- a weak acid combined with its conjugate base
Now, examining each of the choices:
1- KOH and NH3: since they are both bases, thus this mixture is not a buffer
2- HBr and NaCl: since HBr is a strong acid while NaCl is the salt of another different acid, thus this mixture is not a buffer
3- HCl and HBr: these are both considered to be strong acid, thus this mixture is not a buffer
4- HCHO2 and NaCHO2: as for HCH02, it is considered a weak base while NaCHO2 is considered its conjugate base, thus this mixture is a buffer
The answer my friend is dense and here is why if you compact dense food it becomes even more flat and there is more room for food.
