Question

Can you please provide questions on mole concept for practice

Answer 1

1. How many moles are in the following:
   
   a. 1.29 x 10²⁴ hydrogen atoms in HF ; 2.14 moles H atoms
   
   b. 7.36 x 10²⁴ free oxygen atoms ; 12.2 moles O atoms
   
   c. 3.28 x 10²³ Na atoms in salt (NaCl) ; 0.545 moles Na atoms
2. How many atoms are present in the following?
   
   a. Hydrogen atoms in 3.14 mol of H₂O ;3.78 x 10²⁴ H atoms
   
   b. Nitrogen atoms in 2.79 mol of NH₃ ;1.68 x 10²⁴ N atoms
   
   c. Oxygen atoms in 4.90 mol in Al₂O₃ ;8.85 x 10²⁴ O atoms
3. How many atoms are in a 3.56 g sample of Cu? Is this a mol of Cu? ;3.37 x 10²² Cu atoms
4. How many g of CaCO₃ are present in a sample if there are 4.52 x 10²⁴ atoms of carbon in that sample? ;751 g CaCO₃
5. How many g of CaCO₃ are present in a sample if there are 4.52 x 10²⁴ atoms of carbon in that sample? ;751 g CaCO₃
6. How many molecules of HCl are in 4.91 L of HCl acid at 25°C if the density equals 1.096 g/mL? ;8.88 x 10²⁵ molecules
7. If a 1.000 gallon (3.785 L) bottle were filled with bleach (NaClO), how many Cl atoms would be in the bottle? r_bleach = 1.090 g/mL; 3.33 x 10²⁵ Cl atoms
8. At 25º C, the density of water is 0.997 g/ml. At -10º C, the density of ice is 0.917 g/cm³. If a bottle with a volume of 275 mL were filled fully with water at 25º C and then frozen to -10º C, could the ice still be contained in the bottle? What would the volume of the ice be?; 299 mL