The procedure for a reaction directs you to use 0.057 mol of the liquid ester, methyl benzoate (M. W. 136.15, d 1.094 g/mL), in your reaction. How many mL of methyl benzoate would you need to measure in a graduated cylinder in order to have the required number of mols ([0.057 mol)?

7.1 mL

Explanation:

Step 1: Given data

Moles of methyl benzoate (n): 0.057 mol

Molar mass of methyl benzoate (M): 136.15 g/mol

Density of methyl benzoate (ρ): 1.094 g/mL

Step 2: Calculate the mass corresponding to 0.057 moles of methyl benzoate

We will use the following expression.

m = n × M = 0.057 mol × 136.15 g/mol = 7.8 g

Step 3: Calculate the volume corresponding to 7.8 g of methyl benzoate

We will use the density formula.

ρ = m/V

V = m/ρ

V = 7.8 g/1.094 g/mL

V = 7.1 mL

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.