Na chemical reaction, exactly 2 mol of substance a react to produce exactly 3 mol of substance b. 2a⟶3b how many molecules of substance b are produced when 27.6 g of substance a reacts? the molar mass of substance a is 27.8 g/mol. step 1: convert the mass of a to moles. moles of a: mol step 2: convert the number of moles of a to the number of moles of b. moles of b: mol step 3: convert the number of moles of b to molecules of b. molecules of b:

Answers:

Step 1: Convert the mass of A to moles. moles of A: 0.993 mol Step 2: Convert the number of moles of A to the number of moles of B. moles of B: 1.49 mol Step 3: Convert the number of moles of B to molecules of B. molecules of B: 8.97 × 10²³ molecules

Explanation:

1) Chemical equation (given):

2A⟶3B

2) Follow the given steps:

Step 1: Convert the mass of A to moles.

moles of A:

n = mass in grams / molar massn = 27.6 g / 27.8 g/mol = 0.993 mol of A

Step 2: Convert the number of moles of A to the number of moles of B.

Stoichiometric ratio:

        2 mol A : 3 mol B

Proportion:

       2 mol A / 3 mol B = 0.993 mol A / x

       ⇒ x = 0.993 mol A × 3 mol B / 2 mol A = 1.49 mol of B

Step 3: Convert the number of moles of B to molecules of B.

Avogadro's number: 6.022 × 10²³ molecules / mol1.49 mol × 6.022 × 10²³ molecules / mol = 8.97 × 10²³ molecules of B.

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)

Ithink 2 is the correct