All categories

3 years ago

Using the average atomic mass, calculate the mass in grams of 143 iron atoms

Chemistry

1 answer:

melomori [17]3 years ago

7 0

Answer:

1326.6 × 10⁻²³g

Explanation:

Given data:

Number of atoms of iron = 143 atoms

Average atomic mass of iron = 55.845 amu

Mass of iron = ?

Solution:

It is known that,

55.845 g of iron = one mole of iron = 6.02× 10²³ atoms

For 143 atoms:

143 atoms /6.02× 10²³ atoms × 55.845 g

23.754 × 10⁻²³× 55.845 g

1326.6 × 10⁻²³g

You might be interested in

An atom of hydrogen and an atom of carbon are

LenKa [72]

Answer: -

Organic compounds consisting of only carbon atoms and hydrogen atoms are known as hydrocarbons.

Hydrocarbons are used by us for mainly as a source of energy. Hydrocarbons make up gasoline which is used as fuel in automobiles.

Hydrocarbons depending on the type of unsaturation can be of three types - alkanes, alkenes and alkynes.

5 0

3 years ago

Two 10g blocks, one of copper and one of iron, were heated from 300 K to 400K (a temperature difference of 100 K).

12345 [234]

1) 385 J

2) 450 J

Explanation:

The amount of energy that must be absorbed by a certain substance in order to increase its temperature by $\Delta T$ is given by the equation:

$Q=mC\Delta T$

where

m is the mass of the substance

C is its specific heat capacity

$\Delta T$ is the increase in temperature of the substance

For the block of copper in this problem, we have:

m = 10 g is the mass

$C=0.385 J/gK$ is the specific heat capacity of copper

$\Delta T=400-300 = 100 K$ is the change in temperature

So, the energy absorbed by the block of copper is

$Q=(10)(0.385)(100)=385 J$

Similarly for the block of iron, the energy absorbed by the iron is given by

$Q=mC\Delta T$

where

m is the mass of the block of iron

C is its specific heat capacity of iron

$\Delta T$ is the increase in temperature of the block

Here we have:

m = 10 g is the mass of the block

$C=0.450 J/gK$ is the specific heat capacity of iron

$\Delta T=400-300 = 100 K$ is the change in temperature

So, the energy absorbed by the block of iron is

$Q=(10)(0.450)(100)=450 J$

6 0

2 years ago

MULTIPLE CHOICE

adelina 88 [10]

Answer:

C 2

Explanation:

2Nal + Cl2 → 2NaCl + I2

This is balanced equation

6 0

2 years ago

Which of these is a carbohydrate?<br> O C6H1206<br> O C6H6012<br> C6H1302N<br> C3H7O2NS

amm1812

Answer: The answer is the second choice.

Explanation:

4 0

2 years ago

Read 2 more answers

Is supersaturation possible if recrystallization occurs as a solution of a solid in water cools?

Juli2301 [7.4K]

Answer:

Supersaturation is possible

Explanation:

As a solution of solid in water cools, the dissolved solid would begin to reappear as the solution is now supersaturated at that lower temperature.

When the temperature of a solution is increased, more solute are able to dissolve in solution. A supersaturated solution is one that contains more than the required amount of solute needed to saturate the solution at that particular temperature.

4 0

3 years ago