1. What is the mass in grams of 2.25 mol of the element iron, Fe? 2. What is the mass in grams of 0.375 moles of the element potassium, K?

3. How many moles of calcium, Ca, are in 5.00 g of calcium?

4. How many moles of gold, Au, are in 3.60 x 100 g of gold?

5. How many moles of lead, Pb, are in 1.50 x 1012 atoms of lead?

6. How many moles of tin, Sn, are in 2500 atoms of tin?

7. What is the mass in grams of 7.5 x 1015 atoms of nickel, Ni?

8. How many atoms of sulfur, S, are in 4.00 grams of sulfur?​

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

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.