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Chapter 3: Q6 P (page 61)

Write the formula mass of (a) BaF2and (b)C6H4O4with a reasonable number of digits. Use the periodic table inside the cover of this book to find atomic masses.

Short Answer

Expert verified
  1. The formula mass of BaF2is 175.323806 g/mol.
  2. The formula mass of C6H4O4is 140.0936 g/mol.

Step by step solution

01

Definition of periodic table.

The periodic table, also known as the periodic table of elements, is a table that shows the chemical elements in a tabular format. It's commonly used in chemistry, physics, and other disciplines, and it's considered a chemical icon.

02

Determine the formula mass of BaF2 .

(a)

Atomic weight:

Ba = 137.327 g/mol

F = 18.998403 g/mol

Formula mass = Ba+2F

Formula mass = 137.327 g/mol + 18.998403 g/mol

Formula mass = 175.323806 g/mol

03

Determine the formula mass of C6H4O4.

(b)

Atomic weight:

C = 12.0170 g/mol

H = 1.00794 g/mol

O = 15.9994 g/mol

Formula mass = 6C + 4H + 4O

Formula mass = 6(12.0170 g/mol) + 4(1.00794 g/mol) + 4(15.9994 g/mol)

Formula mass = 140.0936g/mol

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Most popular questions from this chapter

Verify the following calculations:

a)3.1415(卤0.0011)=1.77243(卤0.00033);b)log[3.1415卤0.0011]=0.49714(卤0.00015);c)antilog[3.1415卤0.0011]=1.14470(卤0.00035);d)In[3.1415卤0.0011]=1.14470(卤0.00035);e)log(0.104卤0.0060.0511卤0.0009)=0.800(卤0.015)

You have a stock solution certified by a manufacturer to contain 150.0卤0.3渭驳厂翱42-/mL. You would like to dilute it by a factor of 100 to obtain 1.500渭g/mL. Two possible methods of dilution are stated below. For each method, calculate the resulting uncertainty in concentration. Use manufacturer's tolerances in Tables 2-3 and 2-4 for uncertainties. Explain why one method is more precise than the other.

(a) Dilute 10.00mL up to 100mL with a transfer pipet and volumetric flask. Then take 10.00mL of the dilute solution and dilute it again to 100mL.

(b) Dilute 1.000mL up to 100mL with a transfer pipet and volumetric flask.

Find the absolute and percent relative uncertainty and express each answer with a reasonable number of significant figures.

a)6.2卤0.2-4.1卤0.1=?b)9.43卤0.05脳0.0160.001=?c)6.2卤0.2-4.1卤0.1梅9.43卤0.05=?d)9.43卤0.05脳6.2卤0.2脳10-3+4.1卤0.1脳10-3

3-1. How many significant figures are there in the following numbers?

(a) 1.903 0

(b)0.0391 0

(c) 1.40脳104

Compute the molecular mass and its uncertainty for NH3. What is the percent relative uncertainty in molecular mass?
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