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3 years ago

How many atoms are present in 34.228 g of sodium

1 answer:

4 0

To find the amount of atoms (or molecules) of any element, we multiply the number of mols of element with Avogadro's Number, <span><span>6.022⋅<span>1023</span></span> </span>

<span><span>1.55mol</span> </span> <span><span>Na</span> </span> <span><span><span>6.022⋅<span>1023</span></span><span>1mol</span></span> </span> = <span><span>9.33⋅<span>1023</span></span> </span> atoms of <span>N<span>a </span></span>

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Outline the two main observations that led Wegener to propose the theory of continental drift. (in ur own words)

Reil [10]

Answer:

Due to the known fact that certain animal ect lived on certain country/continents due to climate water type ect when fossils of various animal where found in unusual parts of the earth the theory came that all the continent where joined together due to fossil and rock types being found on continents in which would be impossible to reach if not joined together in the beginning

Explanation:

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3 years ago

Why does a piece of cork float in water?

bazaltina [42]

It has a density lower than 1

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3 years ago

Read 2 more answers

In the reaction Pb + 2Ag+ – Pb2+ + 2Ag, the Ag+ is.

Travka [436]

<h2><u>Question :-</u></h2>

In the reaction Pb + 2Ag+ – Pb2+ + 2Ag, the Ag+ is.

a) Reduced, and the oxidation number changes from +1 to 0.

b) Reduces and the oxidation number changes from +2 to 0.

c) Oxidized and the oxidation number changes from 0 to +1.

d) Oxidized, and the oxidation number changes from +1 to 0.

<h2><u>Solution :-</u></h2>

<h3><u>Given Information :-</u></h3>

<u>Reaction ➢</u> Pb + 2Ag⁺ ⟶ Pb²⁺ + 2Ag

Whether Ag⁺ is:-

a) Reduced, and the oxidation number changes from +1 to 0.

b) Reduces and the oxidation number changes from +2 to 0.

c) Oxidized and the oxidation number changes from 0 to +1.

d) Oxidized, and the oxidation number changes from +1 to 0.

<h3><u>Answer :-</u></h3>

Firstly let us know the meaning of Oxidation & Reduction and Oxidizing & Reducing Agent :-

Oxidation is process of loss of electron(s). Either atom or ion undergoing oxidation, is known as reducing agent.
Reduction is process of gain of electron(s). Either atom or ion undergoing reduction, is known as oxidizing agent.

In this reaction, Ag⁺ gains an electron to get <u>reduced</u> to Ag. The oxidation number changes from +1 to 0. Therefore, Ag+ is an oxidizing agent.

Since, this possibility is given in option a). Reduced, and the oxidation number changes from +1 to 0. Hence, option a is the correct answer.

<h2><u>Final Answer :-</u></h2>

Option a. Reduced, and the oxidation number changes from +1 to 0 is correct answer.

5 0

2 years ago

A hydrogen atom has a diameter of about 10 nm. Express this diameter in micrometers, meters, and millimeters.

MariettaO [177]

1) 1 nm = 0.001 µm; one nanometer is equal to 0.001 (10⁻³) micrometer.

d(H) = 10 nm; diameter of hydrogen atom.

d(H) = 10 nm · 0.001 µm/nm.

d(H) = 0.01 µm = 10⁻² µm.

2) 1 nm = 10⁻⁹ m ; one meter is equal to 0.0000000001 (10⁻⁹) meter.

d(H) = 10 nm.

d(H) = 10 nm · 10⁻⁹ m/nm.

d(H) = 0.00000001 m = 10⁻⁸ m.

3) 1 nm = 10⁻⁶ mm ; one nanometer is equal to 0.000001 (10⁻⁶) millimeter.

d(H) = 10 nm · 10⁻⁶ mm/nm.

d(H) = 0.00001 mm = 10⁻⁵ mm.

4 0

3 years ago

Read 2 more answers

What is 87000000000000 written in scientific notation

Elan Coil [88]

Answer:

8.7 × 10 13

Explanation:

5 0

3 years ago