I might be dumb but I have been stuck on this for way too long and need some help.

If you burn 10 kilograms of wood in a fire (combustion) what is the weight of the products after the fire has finished burning the wood?

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

When electrolyzing copper (ll) chloride, what reaction takes place at the anode? what reaction takes place at the cathode?