Chapter 3: Q14P (page 62)
Rewrite the number 3.123 56 (±0.167 89%) in the forms (a) number (± absolute uncertainty) and (b) number (± percent relative uncertainty) with an appropriate number of digits.
Chapter 3: Q14P (page 62)
Rewrite the number 3.123 56 (±0.167 89%) in the forms (a) number (± absolute uncertainty) and (b) number (± percent relative uncertainty) with an appropriate number of digits.
All the tools & learning materials you need for study success - in one app.
Get started for freeAvogadro's number can be computed from the following measured properties of pure crystalline silicon:
(1) atomic mass (obtained from the mass and abundance of each isotope), (2) density of the crystal, (3) size of the unit cell (the smallest repeating unit in the crystal), and (4) number of atoms in the unit cell. For the material that was used, the average atomic mass of Si is role="math" localid="1663313481329" , where 35 is the uncertainty (standard deviation) in the last two digits. The density is , the size of the cubic unit cell is , and there are 8 atoms per unit cell. Avogadro's number is computed from the equation
From the measured properties and their uncertainties, compute Avogadro's number and its uncertainty.
To find the uncertainty of use the function in Table 3-1.
Compute the molecular mass and its uncertainty for . What is the percent relative uncertainty in molecular mass?
Round each number as indicated:
Express the molecular mass of with the correct number of significant figures.
Suppose that in a gravimetric analysis, you forget to dry the filter crucibles before collecting precipitate. After filtering the product, you dry the product and crucible thoroughly before weighing them. Is the apparent mass of product always high or always low? Is the error in mass systematic or random?
What do you think about this solution?
We value your feedback to improve our textbook solutions.