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4 years ago

A lead atom has a mass of 3.14 x 10 to the negative 22nd g.How

Chemistry

1 answer:

frozen [14]4 years ago

4 0

Explanation:

The given data is as follows.

Mass of a lead atom = $3.14 \times 10^{-22}$

Volume = 2.00 $cm^{3}$

Density = 11.3 $g/cm^{3}$

As it is mentioned that 1 cubic centimeter contains 11.3 grams of lead.

So, in 2 cubic centimeter there will be $2 \times 11.3 g = 22.6 g$ of lead atoms.

One lead atom has a mass of $3.14 \times 10^{-22}$ . Therefore, number of atoms present in 22.6 g of lead will be as follows.

$\frac{22.6 g}{3.14 \times 10^{-22}}$

= $7.197 \times 10^{22} atoms$

Thus, we can conclude that there are $7.197 \times 10^{22} atoms$ of lead are present.

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Show your work, including units, for the following series of calculations: a. How many moles of Al are in 1.25 g of Al? b. For t

elixir [45]

Answer:

1) 1.25 grams of Al is 0.0463 moles of Aluminium

2) Aluminium and alum have a 1:1 ratio that means for 1 mole of aluminium consumed, there is 1 mole of alum produced.

3)The theoretical yield is 21.96 g alum

4) The percentage yield is 68.97 %

Explanation:

1) Aluminium (Al) has a molar mass of 26.98 g/mole

To calculate the number of moles in 1.25g of Aluminium, we calculate the following equation:

moles aluminium = 1.25g /26.98g/mole = 0.0463 moles

1.25 grams of Al is 0.0463 moles of Aluminium

2) The netto reaction for the synthesis of alum is:

Al3+(aq) + K1+(aq) + 2 SO42-(aq) + 12 H2O ---> KAl(SO4)2.12H2O(s)

Aluminium and alum have a 1:1 ratio that means for 1 mole of aluminium consumed, there is 1 mole of alum produced.

3) Molar mass of aluminium = 26.98 g/mole

moles of aluminium = mass of aluminium / molar mass of aluminium

moles of aluminium = 1.25g / 26.98g/mole = 0.0463 moles

Aluminium and alum have a 1:1 ratio that means for 0.0463 mole of aluminium consumed, there is 0.0463 moles of alum produced.

Mass of alum = moles of alum * molar mass of alum

Mass of alum = 0.0463 moles * 474.22 g/mole = 21.96g alum

The theoretical yield is 21.96 g alum

4) percentage yield = produced mass / theoretical yield

Percentage yield = 14.96g/ 21.96g *100% = 68.97 %

The percentage yield is 68.97 %

4 0

3 years ago

Can someone help? Name the compound:

Serhud [2]

CH=benzene

Why?

benzene is represented by the empirical formula CH, which indicates that a typical sample of the compound contains one atom of carbon (C) to one atom of hydrogen (H).

----(Is this what you meant???)

5 0

2 years ago

What environmental factors affect animal characteristics? factor that could affect

Annette [7]

Answers:

There's many factors, such as the temperature, rainfall, food available, and the surrounding terrain, that all can effect an animal's characteristics.

8 0

3 years ago

Read 2 more answers

How many total atoms are in 0.560 g of P2O5

ioda

Answer:

16.499 × 10∧ 21 atoms

Explanation:

Given data:

mass of P2O5= 0.560 g

number of atoms= ?

first of all we will calculate the molar mass of P2O5:

P = 2×31 g/mol = 62 g/mol

O = 5× 16 = 80 g/mol

molar mass of P2O5 = 142 g/mol

Noe we will find the moles of 0.560 g P2O5:

moles = mass / molar mass

moles = 0.560 g/ 142 g/mol

moles = 0.0039 mol

now we will find the atoms present in 0.0039 moles:

0.0039 × 6.02 × 10∧ 23 molecules

2.357 × 10∧ 21 molecules

P2O5 consist of 7 atoms:

2.357 × 10∧ 21 × 7 = 16.499 × 10∧ 21 atoms

7 0

3 years ago

Which of the following statements about benzene is true? Multiple Choice

fenix001 [56]

Answer: option a and d

Explanation:

Option A- Benzene undergoes substitution reaction

Example : benzene reacts with chlorine to form chlorobenzene, in the presence of Iron

(iii) chloride as a catalyst

C6H6 + Cl2 ---> C6H5Cl + HCl

Option D- Benzene also undergoes addition reaction

Example: benzene reacts with hydrogen , in the presence of nickel as a catalyst to form

cyclohexane

C6H6 + 3H2 ---> C6H12

Reasons why Option B isn't the answer

Although benzeme has degree of unsaturation but it's not five degree of unsaturation.

Benzene has 6 carbon atoms and 4 degrees of unsaturation (1 ring and 3 double

bonds).

If you work backwards and double the degrees of unsaturation you have 8 degrees of

unsaturation instead of 5.

Option C - Benzene isn't a saturated hydrocarbon

6 0

3 years ago