Hmm... I'm unsure but its either B or D.
600,000 mm if im not mistaken.
Answer:
If a reaction produces a gas such as oxygen or carbon dioxide, there are two ways to measure the reaction rate: using a gas syringe to measure the gas produced, or calculating the reduction in the mass of the reaction solution.
I believe it is D. They can contain different types of atom the can contain different type of arms and molecule
