Question

of 0.518 moles of platinum (pt)? round your answer to three numbers. type in your numeric answer (without the units)

Explanation:

Step1: Recall molar mass of Pt

Molar mass of Pt is 195.08 g/mol.

Step2: Calculate mass using moles

Mass = moles × molar mass = 0.518 mol × 195.08 g/mol
Calculate 0.518 × 195.08: 0.518×195.08 ≈ 101.05

Step3: Round to three significant figures

101.05 rounded to three significant figures is 101 (or 1.01×10², but as per instruction, numeric answer without units, rounded to three numbers - assuming three significant figures). Wait, maybe the question is about mass? Wait, the original question seems to be "What is the mass of 0.518 moles of platinum (Pt)? Round your answer to three significant figures. Type in your numeric answer (without the units)". So let's recalculate: 0.518 195.084 = 0.518195.084. Let's compute 195.084 0.5 = 97.542, 195.084 0.018 = 3.511512, total is 97.542 + 3.511512 = 101.053512. Rounded to three significant figures: 101 (since 0.518 has three significant figures, 195.084 has more, so result should have three. 101.053512 rounded to three significant figures is 101.

Answer:

101