Answer:
Table salt has a uniform and definite composition. It is not a mixture because the sodium and the chlorine are chemically bonded, meaning you cannot take the sodium out of the chlorine or vice versa.
Explanation:
All samples of salt are chemically identical, whereas a mixture can vary. For example, salt water is a mixture because you can have differing amounts of salt or water. The composition is not the same all the way throughout.
<h3>
Answer: 144 g</h3>
Explanation:
Mass of glucose = moles × molar mass
∴ Mass of glucose = 0.8 mol × 180 g mol⁻¹
= 144 g
∴ the mass of glucose you need to have 0.8 mol of glucose = 144 g
<span>50.2 kJ = 333 kJ/kg * mass of water
mass of water is 0.15075075075075075075075075075075 kg
therefore mass of unfrozen water is 0.10924924924924924924924924924925 kg</span>
<h3>
Answer:</h3>
The mole fraction of carbon dioxide is 0.0559
<h3>
Explanation:</h3>
- Mole fraction of a gas in a mixture of gases its given by dividing the number of moles of the gas by the total number of moles of the mixture.
In this case, we are given a mixture of N₂, CO₂ and He
To find the mole fraction of CO₂, first we need to calculate the total number of moles in the mixture.
Individual number of moles for each gas are;
Moles = mass ÷ Molar mass
Therefore;
Nitrogen gas (N₂)
Mass =18.0 g
Molar mass = 28.02 g/mol
= 0.642 moles N₂
Helium gas (He)
Mass = 50.5 g
Molar mass = 4.0 g/mol
= 12.625 moles He
Carbon dioxide (CO₂)
Mass = 34.6 g
Molar mass = 44.01 g/mol
= 0.786 moles CO₂
Therefore;
The total number of moles in the mixture;
= 0.642 moles + 12.625 moles + 0.786 moles
= 14.053 moles
Thus;
The mole fraction of CO₂= Moles of CO₂ ÷ Total number of moles
= 0.786 moles ÷ 14.053 moles
= 0.0559
Hence the mole fraction of carbon dioxide is 0.0559