How many moles of silver atoms are in 1.8x10^20 atoms of silver? a. 3.0x10^-4 b. 3.3x10^-3 c. 3.0x10^2 d. 1.1x10^44 #19 in photo add work and explanation

Taking into account the definition of avogadro's number, the correct answer is option A. 3×10⁻⁴ moles of silver are 1.8×10²⁰ atoms of silver.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 6.023×10²³ atoms are contained in 1 mole of silver, then 1.8×10²⁰ atoms are contained in how many moles of silver?

amount of moles of silver= (1.8×10²⁰ atoms × 1 mole)÷ 6.023×10²³ atoms

amount of moles of silver≅ 3×10⁻⁴ moles

Finally, the correct answer is option A. 3×10⁻⁴ moles of silver are 1.8×10²⁰ atoms of silver.

Learn more about Avogadro's Number:

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3.0 x 10⁻⁴ moles

Explanation:

Given parameters:

Amount of Ag atoms = 1.8 x 10²⁰ atoms

Unknown:

Number of moles of Ag atoms

Solution:

From mole concept, we know that a mole of a substance contains Avogadros number of particles.

The Avogadro's number of particles is 6.02 x 10²³.

Now:

Number of moles

= number of particles/6.02 x 10²³

Therefore:

Number of moles= 1.8 x 10²⁰ / 6.02 x 10²³

Number of moles = 0.3 x 10⁻³ moles

= 3.0 x 10⁻⁴ moles

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.