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3 years ago

An atom has 5 protons and 7 neutrons. What is its mass number?

Chemistry

2 answers:

VikaD [51]3 years ago

8 0

Mass number = No. of protons + No. of neutrons

= 5 + 7

= 12 u.

Thus, the answer is 12 u.

lisabon 2012 [21]3 years ago

3 0

Mass number = protons + neutrons
mass number = 5 + 7
mass number = 12

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Chase had determined the boiling point of an unknown liquid to be 45.2 ⁰C when the correct boiling point is 44.32 ⁰C. What is th

Nataly_w [17]

Answer:

The boiling point of the liquid is 47.368°C

Explanation:

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2 years ago

A quantity of NaCl was dissolved in 100 cm of solution to obtain

soldi70 [24.7K]

Answer:

2.93g

Explanation:first, let us calculate the number of mole of NaCl present in the solution. This is illustrated below:

Molarity = 0.5M

Volume = 100cm^3 = 100/1000 = 0.1L

Mole =?

Molarity = mole /Volume

Mole = Molarity x Volume

Mole of NaCl = 0.5 x 0.1 = 0.05mole

Now we can obtain the mass of NaCl as follows:

Molar Mass of NaCl = 23 + 35.5 = 58.5g/mol

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Mass of NaCl =?

Mass = number of mole x molar Mass

Mass of NaCl = 0.05 x 58.5

Mass of NaCl = 2.93g

7 0

3 years ago

How many atoms in the pictured molecule can form hydrogen bonds with water molecules anatomy?

garri49 [273]

55..............................

6 0

2 years ago

What are three possible blood type alleles?

Keith_Richards [23]

Answer:

Three possible blood type alleles are Iᴬ, Iᴮ and i

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<u>-TheUnknownScientist</u>

8 0

2 years ago

Read 2 more answers

Calculate the % composition of the unknown liquid using your most precise result. It is a mixture of ethanol (D[ETOH] = 0.7890 g

Rufina [12.5K]

% composition of ethanol = 34.51%

% composition of water = 65.49%

<h3>What is density?</h3>

A material's density is defined as its mass per unit volume.

Given data:

The density of ethanol = 0.7890 g/mL

The density of water = 0.9982 g/mL

The density of mixture = 0.926 g/mL

Let the % composition of ethanol = x

Let the % composition of water = 100-x

Now density of the mixture

$\frac{Mass}{Volume}$

$Mass = \frac{percent \;of \;ethanol \;X \;density \;of \;ethanol \;+ \\ \;percent \;of \;water X \;density \;of \;water}{100}$

$0.926 = \frac{x X 0.7890 g/mL \;+ (100-x) X 0.9982 g/mL}{100}$

$x= 34.51$ %

Hence,

% composition of ethanol = 34.51%

% composition of water = 65.49%

Learn more about the density here:

brainly.com/question/952755

#SPJ1

8 0

1 year ago