Answer:
pass hahaha dkopa alam yarn
I can give you four oxygen, selenium, sulfur, talarium hope this helps!
CO2 ; H20- They are the only ones that, on both sides, combined with another element and bonding of atoms
I think because each element has its own number of protons and neutrons, giving it its own atomic number and mass (correct me if I’m wrong please)
Answer:
The expression to calculate the mass of the reactant is 
Explanation:
<em>The amount of heat released is equal to the amount of heat released per gram of reactant times the mass of the reactant.</em> To keep to coherence between units we need to transform 1,080 J to kJ. We do so with proportions:

Then,
