Answer:
5.9 kg
Explanation:
We must work backwards from the second step to work out the mass of oxygen.
1. Second step
Mᵣ: 55.84
Fe₂O₃ + 3CO ⟶ 2Fe + 3CO₂
m/kg: 7.0
(a) Moles of Fe
(b) Moles of CO
However, this is the theoretical yield.
The actual yield is 72. %.
We need more CO and Fe₂O₃ to get the theoretical yield of Fe.
(c) Percent yield
We must use 261 mol of CO to get 7.0 kg of Fe.
2. First step
Mᵣ: 32.00
2C + O₂ ⟶ 2CO
n/mol: 261
(a) Moles of O₂
(b) Mass of O₂
However, this is the theoretical yield.
The actual yield is 71. %.
We need more C and O₂ to get the theoretical yield of CO.
(c) Percent yield
We need 5.9 kg of O₂ to produce 7.0 kg of Fe.
Answer:
water vapour
Explanation:
water vapour condents to water/rain
Answer:
It copies itself and gives instructions for building cells.
It provides energy to cells and passes from parent to offspring
Explanation:
The DNA is the genetic materials of the cell upon which any form of inheritance is predicated.
This giant molecules is a very important organelle in all living organisms. It has a double helix structure and can be found within the nucleus.
- The DNA copies itself and gives instruction for building cells.
- It has important information needed by the cell to produce protein so DNA replication is a vital process.
- The DNA is also able to ration energy within the cell.
- It passes genetic materials from parents to offspring
Answer:
Invasive species are living things not naturally found in that ecosystem. They upset the natural balance.
Explanation:
Answer:
Metals Good conductors of electricity good conductors of heat
High density
Malleable and ductile
Non-metals
Poor conductors of electricity
Poor conductors of heat
Low density
brittle
