Chemistry, 06.03.2021 06:40 Welcomes

What is the mass in grams of 1.00 x 10^12 lead (Pb)
atoms?

Answers: 2

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Answers

Answer from: jaylabazemore

3.44 × 10⁻¹⁰ g Pb

General Formulas and Concepts:

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Chemistry

Atomic Structure

Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Stoichiometry

Using Dimensional AnalysisExplanation:

Step 1: Define

[Given] 1.00 × 10¹² atoms Pb

[Solve] grams Pb

Step 2: Identify Conversions

Avogadro's Number

[PT] Molar Mass of Pb - 207.2 g/mol

Step 3: Convert

[DA] Set up: $\displaystyle 1.00 \cdot 10^{12} \ atoms \ Pb(\frac{1 \ mol \ Pb}{6.022 \cdot 10^{23} \ atoms \ Pb})(\frac{207.2 \ g \ Pb}{1 \ mol \ Pb})$ [DA] Multiply/Divide [Cancel out units]: $\displaystyle 3.44072 \cdot 10^{-10} \ g \ Pb$

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

3.44072 × 10⁻¹⁰ g Pb ≈ 3.44 × 10⁻¹⁰ g Pb

Answer from: abbydamaso5048

$\boxed {\boxed {\sf 3.44 *10^{-10} \ g \ Pb}}$

Explanation:

1. Atoms to Moles

Use Avogadro's Number to convert atoms to moles. This number: 6.022*10²³, tells us the number of particles (atoms, molecules, etc.) in 1 mole of a substance. In this case, the particles are atoms of lead.

$\frac {6.022*10^{23} \ atoms \ Pb}{1 \ mol \ Pb}$

Multiply by the given number of atoms.

$1.00 *10^{12} \ atoms \ Pb *\frac {6.022*10^{23} \ atoms \ Pb}{1 \ mol \ Pb}$

Flip the fraction so the atoms of lead cancel.

$1.00 *10^{12} \ atoms \ Pb *\frac {1 \ mol \ Pb}{6.022*10^{23} \ atoms \ Pb}$

$1.00 *10^{12}*\frac {1 \ mol \ Pb}{6.022*10^{23}}$

$\frac {1.00 *10^{12}\ mol \ Pb}{6.022*10^{23}} = 1.66057788*10^{-12} \ mol \ Pb$

2. Moles to Grams

Use the molar mass to convert moles to grams. This can be found on the Periodic Table. For lead it is 207.2 grams per mole.

$\frac {207.2 \ g\ Pb}{ 1 \ mol \ Pb}$

Multiply by the number of moles we calculated.

$1.66057788*10^{-12} \ mol \ Pb* \frac {207.2 \ g\ Pb}{ 1 \ mol \ Pb}$

$1.66057788*10^{-12}* \frac {207.2 \ g\ Pb}{ 1 }$

$1.66057788*10^{-12}* {207.2 \ g\ Pb}= 3.44071737*10^{-10} \ g \ Pb$

3. Round

The original measurement of atoms has 3 significant figures, so our answer must have the same. For the number we calculated, it is the hundredth place. The 0 in the thousandth place tells us to leave the 4.

$3.44 *10^{-10} \ g \ Pb$

Answer from: Quest

passed in september 1935, these laws are known as nuremberg laws. they forbid jews from marrying but not directly forced them to divorce aryans. what is most noticeable is the fact that the jews were defranchised, meaning by this that they were not expected to have any civil rights, including the right to vote. the right answer is deprived of the right to vote.

Answer from: Quest

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of c is as shown here in the image.

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