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lesya [120]
3 years ago
7

How many atoms of lead are in 3.5 moles of lead?

Chemistry
1 answer:
vagabundo [1.1K]3 years ago
3 0

Answer:

2.1 × 10²⁴ atoms Pb

Explanation:

Avogadro's number: 6.022 × 10²³

Step 1: Find conversions

1 mol Pb = 6.022 × 10²³ atoms Pb

Step 2: Use Dimensional Analysis

3.5 \hspace{3} mol \hspace{3} Pb(\frac{6.022(10)^{23} \hspace{3} atoms \hspace{3} Pb}{1 \hspace{3} mol \hspace{3} Pb} ) = 2.107 × 10²⁴ atoms Pb

Step 3: Simplify

We have 2 sig figs.

2.107 × 10²⁴ atoms Pb ≈ 2.1 × 10²⁴ atoms Pb

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NItrogen in air reacts at high temperature to form NO2 according to the reaction:
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Answer:

The correct answer is option E.

Explanation:

Structures for the reactants and products are given in an aimage ;

Number of double bonds in oxygen gas molecule = 1

Number of double bonds in nitro dioxide gas molecule = 1

Number of single bond in in nitro dioxide gas molecule = 1

Number of triple bonds in nitrogen gas molecule = 1

N_2+2O_2\rightarrow 2NO_2,\Delta H=?

\Delta H=[2 mol\times \Delta H_{f,NO_2}]-[1 mol\times \Delta H_{f,N_2}-2 mol\times \Delta H_{f,O_2}]

\Delta H_{f,NO_2}=33.18 kJ/mol

\Delta H_{f,N_2}=0 (pure element)

\Delta H_{f,O_2}=0 (pure element )

\Delta H=2 mol\times 33.18 kJ/mol=66.36kJ=15.86 kcal

The enthalpy of the given reaction is 15.86 kcal.

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Calculate the value of the equilibrium constant, Kc , for the equilibrium shown below, if 0.124 moles of NO, 0.0240 mole of H2,
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the reaction is

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