What is the mass in grams of each of the following samples? Part A 2.0×10−3 molmol of sodium Express your answer using two significant figures. mm = nothing gg SubmitRequest Answer Part B 2.0×10−3 molmol of lead Express your answer using two significant figures.

Part A. Mass = 0.12 g of NaCl

Part B. Mass = 0.41 g of Pb

Explanation:

Part A. We verify the moles

2×10⁻³ moles of NaCl

Let's determine the molar mass → Molar mass Na + Molar mass Cl

23 g/mol + 35.45 g/mol = 58.45 g/mol

We convert moles to g → 2×10⁻³ mol . 58.45 g/mol = 0.11 g

Part B. → 2×10⁻³ moles of Pb; Molar mass = 207.2 g/mol

We convert moles to g → 2×10⁻³ mol . 207.2 g/mol = 0.41 g of Pb

a is the correct answer