Given that equation na+(s)o2–> na2o. find the mass of sodium needed to produce 12.5 grams of sodium oxide.

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

How many moles of lead are in 1.50 x 10^12 atoms of lead? could you explain the answer as well and not just give it to me i am refreshing for finals and i need to know how to do it

1.17 mol hcl and 2.5 mol naoh react according to the equation hcl + naoh -> nacl + h2o . if the limiting reactant is hcl, determine the amount of excess reactant that remains. answer in units of mol.