Answer:
Oxygen supports combustion so a good method of testing for oxygen is to take a glowing splint and place it in a sample of gas, if it re-ignites the gas is oxygen. This is a simple but effective test for oxygen.
Explanation:
B
so you can see the difference
A. a magnet
Iron fillings could be separated from sand using a magnet
Answer: The molar mass and molecular weight of 4Fe is 223.38.
answer is in the link because it says my answer contains inappropriate words