Ask question

Ask question

All categories

4 years ago

8

Why are atomic masses on the Periodic Table written in decimals when they are based on mass numbers that can be whole numbers?

1 answer:

grandymaker [24]4 years ago

6 0

The atomic masses on the periodic table of elements are written in decimals when they are based on mass numbers that can be whole numbers is that most of the atomic masses written in the periodic table of elements are not whole numbers, and also, it is based on the natural abundance of the elements.

You might be interested in

Convert the following numbers of calories or

nignag [31]

Answer:

a 32823.48joules

b 1979.8688 joules

c. 1979.8688

Explanation:

4 0

3 years ago

The 1995 Nobel Prize in chemistry was shared by Paul Crutzen, F. Sherwood Rowland, and Mario Molina for their work concerning th

Nikolay [14]

Answer:

$\Delta H_{rxn3}=-162.5 kJ/mol$

Explanation:

The reaction we need to calculate:

$O_3 (g) + Cl (g) \longrightarrow ClO (g) + O_2 (g)$

1) $O_3 (g) + ClO (g) \longrightarrow Cl (g) +2 O_2 (g)$

$\Delta H_{rxn}=-122.8 kJ/mol$

We need the ClO in the products side, so we use the inverse of this reaction:

$Cl (g) +2 O_2 (g) \longrightarrow O_3 (g) + ClO (g)$

$\Delta H_{rxn1}=122.8 kJ/mol$

2) $2 O_3 (g) \longrightarrow 3 O_2 (g)$

$\Delta H_{rxn2}=-285.3 kJ/mol$

Now we need to combine this two:

$Cl (g) +2 O_2 (g) + 2 O_3 (g)\longrightarrow O_3 (g) + ClO (g) + 3 O_2 (g)$

$Cl (g) + O_3 (g)\longrightarrow ClO (g) + O_2 (g)$

The enthalpy of reaction:

$\Delta H_{rxn3}=\Delta H_{rxn1}+ \Delta H_{rxn2}=122.8 kJ/mol-285.3 kJ/mol$

$\Delta H_{rxn3}=-162.5 kJ/mol$

4 0

3 years ago

What is the molar mass of Ca(OH)2?

liubo4ka [24]

Answer: the molar mass is 74.092 g/mol

Explanation:

8 0

4 years ago

Atoms of the LEAST reactive elements tend to have A. one or seven valence electrons. B. eight valence electrons. C. four or five

Tomtit [17]

B. eight valence electrons.

3 0

3 years ago

Read 2 more answers

Help me plzz it’s for

Rudik [331]

What is it ? I can’t see

5 0

3 years ago