Question

1.A bucket of nails contains 348 nails. How many dozens of nails does the bucket contain? 1 dozen=12 objects 2.How many atoms are in 3.56 mol of pure aluminum? 3.For the given elements, convert the given mole amounts to grams. A.How many grams are in 0.0564 moles of lithium? B.How many grams are in 0.550 moles of cobalt? C.How many grams are in 0.790 moles of oxygen? 4.For the given elements, convert 1.00 gram of that element to moles. A.How many moles of beryllium are in 1.00 gram? B.How many moles of zinc are in 1.00 gram? C.How many moles of phosphorus are in 1.00 gram?

Answer 1

A bucket of nails contains 348 nails. How many dozens of nails does the bucket contain? 1 dozen=12 objects

= 1 dozen=12 objects

= 348/12

= 29 dozen

2. How many atoms are in 3.56 mol of pure aluminum?

1 mole = 6.0221415×10^23

No. of atoms=no. of moles * Avogadro’s number

No. of atoms = 3.56 * 6.0221415×10^23

No. of atoms =21.44×10^23

3. For the given elements, convert the given mole amounts to grams. A. How many grams are in 0.0564 moles of lithium?

1 mole Li = 6.94 grams .

0.0564 moles of lithium = 0.391416

B. How many grams are in 0.550 moles of cobalt?

1 mole = 58.9332 grams

58.9332*0.550 = 32.41

C. How many grams are in 0.790 moles of oxygen?

1 mole oxygen = 16 grams

0.790 moles of oxygen = 12.64

4. For the given elements, convert 1.00 gram of that element to moles.

A. How many moles of beryllium are in 1.00 gram?

1 mole of beryllium = 9.01g

1 g of beryllium = 0.110960 mole

B. How many moles of zinc are in 1.00 gram?

1 mole of zinc = 65.38 g

1 gram of zinc = 0.01529

C. How many moles of phosphorus are in 1.00 gram?

1 moles Phosphorus = 30.973g

1 g Phosphorus = 0.032285