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3 years ago

What types of predictions can be made using the Periodic Table?

1 answer:

8 0

Periodic trends are specific patterns that are present in the periodic table that illustrate different aspects of a certain element, including its size and its electronic properties. Major periodic trends include: electronegativity, ionization energy, electron affinity, atomic radius, melting point, and metallic character. Periodic trends, arising from the arrangement of the periodic table, provide chemists with an invaluable tool to quickly predict an element's properties. These trends exist because of the similar atomic structure of the elements within their respective group families or periods, and because of the periodic nature of the elements.

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If the pressure on the surface of water in the liquid stato

Novosadov [1.4K]

The water will boil at C) 80°C

<h3>Further explanation</h3>

Given

Vapour pressure of water = 47 kPa

Required

Boiling point of water

Solution

We can use the Clausius-Clapeyron equation :

$\tt ln(\dfrac{P_1}{P_2})=\dfrac{-\Delta H_{vap}}{R}(\dfrac{1}{T_1}-\dfrac{1}{T_2})$

Vapour pressure of water at boiling point 100°C=101.325 kPa

ΔH vap for water at 100°C=40657 J/mol

R = 8.314 J/mol K

T₁=boiling point of water at 101.325 kPa = 100+273=373 K

Input given values :

$\tt ln\dfrac{101.325}{47}=\dfrac{-40657}{8.314}(\dfrac{1}{373}-\dfrac{1}{T_2})\\\\0.7682=4890.1852(\dfrac{1}{373}-\dfrac{1}{T_2})\\\\0.0001571=(\dfrac{1}{373}-\dfrac{1}{T_2})\\\\\dfrac{1}{T_2}=0.00283\rightarrow T_2=353~K=80^oC$

6 0

3 years ago

How many moles of hydrochloric acid are required to produce .40 moles of hydrogen gas?

mash [69]

Answer:

0.80 Moles of Hydrochloric Acid would be required to produce 0.40 Moles of hydrogen gas due to the equation ratios

Explanation:

How many moles of hydrochloric acid are required to produce .40 moles of hydrogen gas?

Hydrochloric acid = HCl

Hydrogen gas = H2

H = 1+

Cl = 1-

HCL = H2 + Cl2

2HCl = H2 + Cl2

2:1:1

0.80 = 0.40 + 0.40

4 0

3 years ago

Need help ASAP <br> Ahsb

MArishka [77]

A but not sure for 100%

8 0

3 years ago

Read 2 more answers

In which substance does clorine have an oxidation number of +5?

Oksi-84 [34.3K]

Answer:oxidation number H = +1

oxidation number O = -2

let x = oxidation number Cl

in HClO3

+1 + x -6 =0

x = +5

Explanation:

3 0

4 years ago

What is the pressure, in atm, of 24.5 L of ideal gas at 247.8 K if there are 1.8 moles present?

Flura [38]

Answer:

p = 1.5 atm

Explanation:

pV = nRT

p = nRT/V = [1.8 mol×(0.082 atm L/mol K)×247.8 K]/24.5 L

p = 1.5 atm

8 0

3 years ago