Question

3) How many moles are in 22 grams of argon?

4)How many moles are there in 7.4 x 1023 molecules of AgNO3?

5)How many moles are in 15 grams of lithium?

Answer 1

Answer:

4) 0.5507 Mol Ar

5) 44.548 Mol AgNO3

6) 2.16107 Mol Li

Explanation:

Divide = grams to mol and mol to molecules

Multiply = molecules to mol and mol to grams.

3) 22 g of Ar           1 mol                   22

-------------------- * ---------------------- = ------------ (turn to decimal) = 0.5507 Mol Ar

                           39.948 g of Ar     39.948

4) AgNO3 = (Ag;  39.948) (N; 14.007) (O^3; 48)  

39.948 + 14.007 + 48 = 101.955

   7.4 x 10^23 Mc    6.02 x 10^23 Mc

  ---------------------- * ------------------------- = 44.548 Mol AgNO3

                                        1 mol        

5)

15g           1 Mol             15

------- * ------------------- = --------- (turn to decimal) = 2.16107 Mol Li

            6.941 g of Li     6.941