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3 years ago

Define atomic mass unit. The relative atomic mass of oxygen atom is 16. Explain its meaning.

Chemistry

1 answer:

hodyreva [135]3 years ago

7 0

Answer:

The atomic mass of an atom is the number of protons plus neutrons.

Fact: In case you get it confused with atomic number, atomic number is the number of protons in the atom.

Explanation: It could have been electrons plus neutrons since electrons equals protons but electrons aren't stable which is why it is protons and neutrons.

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Show work: Convert 4.21g of K3PO4to atoms

Aloiza [94]

1.1943571. The molar mass of K3PO4 is 212.27. After using stochieometry, you get your answer.

8 0

3 years ago

What is the conecntration of Fe3 and the concentration of No3- present in the solution that result when 30.0 ml of 1.75M Fe(No3)

zvonat [6]

Answer:

$[Fe^{+3}]=0.700 M$

$[NO_{3}^{-}]=2.10 M$

Explanation:

Here, a solution of Fe(NO₃)₃ is diluted, as the total volume of the solution has increased. The formula for dilution of the compound is mathematically expressed as:

$C_{1}. V_{1}= C_{2}.V_{2}$

Here, C and V are the concentration and volume respectively. The numbers at the subscript denote the initial and final values. The concentration of Fe(NO₃)₃ is 1.75 M. As ferric nitrate dissociates completely in water, the initial concentration of ferric is also 1.75 M.

Solving for [Fe],

$[Fe^{+3}]=\frac{C_{1}.V_{1}}{V_{2} }$

$[Fe^{+3}]=\frac{(1.75).(30.0)}{45.0+30.0 }$

$[Fe^{+3}]=0.700 M$

For [NO₃⁻],

There are three moles of nitrate is 1 mole of Fe(NO₃)₃. This means that the initial concentration of nitrate ions will be three times the concentration of ferric nitrate i.e., it will be 5.25 M.

$[NO_{3}^{-}]=\frac{C_{1}.V_{1}}{V_{2} }$

$[NO_{3}^{-}]=\frac{(5.25)(30.0)}{30.0+45.0 }$

$[NO_{3}^{-}]=2.10 M$

7 0

3 years ago

Which statement about the mass of an electron is correct? A The mass of an electron is equal to the mass of the proton. B The ma

geniusboy [140]

Answer:

Explanation:

because mass of an electron is 1/2000.

8 0

3 years ago

Which particle has the same mass as a neutron?

Ilya [14]

Answer:

proton

Explanation:

neutron: A subatomic particle forming part of the nucleus of an atom. It has no charge. It is equal in mass to a proton or it weighs 1 amu.

5 0

3 years ago

Read 2 more answers

What is the molarity of a solution made with 87g of Mgo dissolved in enough water to make

JulsSmile [24]

Answer:

2.70 M.

Explanation:

Molar mass of MgO = 24.3 + 16 = 40.3.

A molar solution will contain 40.3g in 1 Litre.

So 800 mL of 1 molar solution will contain 0.8* 40.3 g MgO.

So the molarity of the given solution

= 87 / (0.8*40.3)

= 2.699 M.

3 0

3 years ago