1. What is the mass of 2.65×1023 atoms of lithium? grams

3.05 grams

Explanation:

To find the mass in grams, we need to use Avogadro's number and the molar mass of lithium.

Avogadro's number: 6.022×10²³ atoms/mol

Molar mass: 6.94 g/mol

what does the table look like

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.