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3 years ago

Which term describes the sum of the number of protons and neutrons in an atom?

Chemistry

2 answers:

topjm [15]3 years ago

8 0

Answer: The term is Mass number.

Explanation:

Atomic number is defined as the number of protons or number of electrons present in an atom. It is represented as Z.

Z = Number of protons = Number of electrons

Mass number is defined as the sum of number of protons and neutrons in an atom. It is represented as A.

A = Number of proton + Number of neutrons

Hence, the correct answer is Mass number.

Alecsey [184]3 years ago

4 0

Protons+Neutrons = Mass Number

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When 0.250 moles of a gas is placed in a container at 298K, it exerts a pressure of 93kPa. What is the volume of the container?

Drupady [299]

I think is c , I’m not sure

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2 years ago

Suppose you had a mixture of 1 moles of methanol and 1 mole of ethanol at a particular temperature. The vapor pressure of pure m

Natasha_Volkova [10]

The total pressure is given by:
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3 years ago

What are 5 physical changes in matter

Gennadij [26K]

Answer:

cutting, bending, dissolving, freezing, and boiling

Explanation:

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2 years ago

Glycerol is a subunit molecule of a

Schach [20]

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So, option C is your answer.

Hope this helps!

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2 years ago

If 45.0 mL of a 0.0500 M HNO3, 10.0 mL of a 0.0500 M KSCN, and 30.0 mL of a 0.0500 M Fe(NO3)3 are combined, what is the initial

jeka94

Answer:

the initial concentration of SCN- in the mixture is 0.00588 M

Explanation:

The computation of the initial concentration of the SCN^- in the mixture is as follows:

As we know that

$KSCN \rightarrow K^ + SCN^-$

As it is mentioned in the question that KSCN is present 10 mL of 0.05 M

So, the total milimoles of SCN^- is

= 10 × 0.05

= 0.5 m moles

The total volume in mixture is

= 45 + 10 + 30

= 85 mL

Now the initial concentration of the SCN^- is

= 0.5 ÷ 85

= 0.00588 M

hence, the initial concentration of SCN- in the mixture is 0.00588 M

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3 years ago