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3 years ago

There are groups on the Periodic Table and __ periods on the Periodic Table. (Type your answers as numbers)

Chemistry

2 answers:

Allisa [31]3 years ago

8 0

Answer:

8 and 7

Explanation:

JulijaS [17]3 years ago

6 0

Answer:

There are 18 groups on the periodic table and there are 7 periods

Explanation:

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5.60 g of an unknown gas at STP fills a 500 mL flask. What is the molar mass of the gas

ale4655 [162]

Hey there!

From ideal gas equation we know, PV = nRT

All the terms have their usual significance.

PV =w/M * RT

( where , n is number of moles = w/M, we = weight of gas, M = molecular weight of the gas)

Therefore, PV = wRT/M

At standard conditions , value of pressure, P = 1atm and standard temperature, T = 273K

And value of universal gas constant, R = 0.082 lit. atm. K⁻¹.mol⁻¹

Given that, weight of gas,

w = 5.60g and volume of gas,

V = 500mL = 0.5 Liters

Therefore, substituting all the value, we get :

Molar mass = 5.60 * 0.082 * 273 / 1 * 0.5

Molar mass = 250.7232 g/mole

3 0

4 years ago

Eli states that sodium phosphate is a mixture because it is composed of both sodium ions and phosphate ions.

Vlad [161]

Answer:

It is incorrect because sodium phosphate is a compound that has a single composition.

Explanation:

Sodium phosphate is a compound and not a mixture. It is made up of sodium and phosphate ions and they exists as just a single compound and not different entities.

The parts of a mixture exists separately and they retain their identities.

In the compound a sodium phosphate we have 3 atoms, Na, P and Oxygen joined together in a definite grouping.
The properties of the compound are different from the individual elements that makes them up.

5 0

3 years ago

Read 2 more answers

What does an atomic number represent in an atom? number of neutrons number of protons number of electrons number of protons and

mr Goodwill [35]

Answer:

The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

8 0

3 years ago

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What is the IUPAC name of this compound? ________ CH3-CHCl-CH2-CH2-Cl

Diano4ka-milaya [45]

Answer:

The prefixes are fluoro-, chloro-, bromo-, and iodo-. Thus CH 3CH 2Cl has the common name ethyl chloride and the IUPAC name chloroethane. Alkyl halides with simple alkyl groups (one to four carbon atoms) are often called by common names.05‏/06‏/2019

6 0

3 years ago

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exactly 1mol of n2o4 is placed in an empty 1 l container. if at equilibrium n2o4 is dissociated 20%, what is the value of equili

egoroff_w [7]

Answer:

K = 0.2

Explanation:

Based on the chemical dissociation of N₂O₄:

N₂O₄ ⇄ 2NO₂

The equilibrium constant, K, of the reaction is:

K = [NO₂]² / [N₂O₄]

Now, if 20% of N₂O₄ is dissociated, 80% remains as N₂O₄ = 0.8mol/L = 0.8M

as 20% is dissociated, 0.2moles of N₂O₄ were dissociated and 0.2*2 = 0.4mol/L of NO₂ are produced.

Replacing in K:

K = [0.4M]² / [0.8M]

5 0

3 years ago

There are ________ groups on the Periodic Table and __________ periods on the Periodic Table. (Type your answers as numbers)

There are groups on the Periodic Table and __ periods on the Periodic Table. (Type your answers as numbers)