Answer: Option (D) is the correct answer.
Explanation:
When aluminium reacts with oxygen, it results in the formation of a layer of aluminium oxide on its surface.
This outer layer gets corroded but it forms a protective coating for the inner layers that prevents from further corrosion.
Thus, we can conclude that metals like aluminum can react with oxygen to form coatings that prevent corrosion.
Answer: 6751 L
Explanation:
1000 mL = 1 L
so dividing 6751 by 1000 gives .6751 L
Answer:
density equals weigt divided by volume
Explanation:
Answer:
Percent yield = 84.5 %
Explanation:
Given data:
Mass of methanol = 229 g
Actual yield of water = 219 g
Percent yield of water = ?
Solution:
Chemical equation:
2CH₃OH + 3O₂ → 2CO₂ + 4H₂O
Number of moles of methanol:
Number of moles = mass/ molar mass
Number of moles = 229 g/ 32 g/mol
Number of moles = 7.2 mol
Now we will compare the moles of water with methanol.
CH₃OH : H₂O
2 : 4
7.2 : 4/2×7.2 = 14.4 mol
Mass of water:
Mass = number of moles × molae mass
Mass = 14.4 mol × 18 g/mol
Mass = 259.2 g
Percent yield:
Percent yield = actual yield / theoretical yield × 100
Percent yield = 219 g / 259.2 g × 100
Percent yield = 84.5 %
It's a chemical change because a new compound is formed
