This is a test please help

The modern periodic table has groups.

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: