D.) He arranged elements by Atomic Masses
try answer multiple choice A: consider the effects of their actions on the environment
The mass of a mole of Cu₂O is basically the molar mass of this compound. To find this, add the molar mass of each atom in the compound together. Therefore you will get 62x2 + 16 = 140 grams
Answer:reaction 1 because a single product is formed
Explanation: all the reactions are being form into two separate products while in reaction 1 is transforming two different products in two one product all together.
