What is the mass in grams of each of the following samples? (b) 0.0015 mol of lead

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Identify the molar mass of lead (Pb) from the periodic table, which is approximately 207.2 g/mol.

Use the formula: \( \text{mass} = \text{moles} \times \text{molar mass} \).

Substitute the given number of moles (0.0015 mol) and the molar mass of lead (207.2 g/mol) into the formula.

Calculate the product of 0.0015 mol and 207.2 g/mol to find the mass in grams.

The result from the calculation will give you the mass of the lead sample in grams.

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주요 개념

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Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all the atoms in a molecule. For lead (Pb), the molar mass is approximately 207.2 g/mol, which is essential for converting moles to grams.

Conversion from Moles to Grams

To convert moles of a substance to grams, you multiply the number of moles by the molar mass of the substance. The formula is: mass (g) = moles × molar mass (g/mol). This conversion is fundamental in stoichiometry, allowing chemists to relate quantities of reactants and products in chemical reactions.

Significant Figures

Significant figures are the digits in a number that contribute to its precision. In scientific calculations, it is important to maintain the correct number of significant figures based on the precision of the measurements involved. For example, the value 0.0015 mol has two significant figures, which should be reflected in the final answer when calculating the mass in grams.