Question

Convert

31.82 grams of ca(oh)2 to moles

3.2 moles of K2SO3 to grams

7.25x10^23 formula units of hcl to moles

46.6L of Cl2 gas to moles at STP

Answer 1

• 0.43 moles Ca(OH)₂

• 506.4 grams K₂SO₃

• 1.20 moles HCl

• 2.080 moles Cl₂

Step-by-step explanation:

-We convert Ca(OH)₂ grams to moles using its molar mass:

• 31.82 g ÷ 74.093 g/mol = 0.43 mol

-We convert K₂SO₃ moles to grams using its molar mass:

• 3.2 mol * 158.26 g/mol = 506.4 g

-One formula unit of HCl is HCl. We convert molecules to moles using Avogadro's number:

• 7.25x10²³ molecules ÷ 6.023x10²³mol/molecules = 1.20 mol

-At STP, one mol of any gas occupies 22.4 L:

• 46.6 L * 1 mol / 22.4 L = 2.080 mol