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3 years ago

What is the mass number of an isotope

2 answers:

8 0

The mass number given on the periodic table is a weighted average of all the isotopes. You get the exact mass of an isotope by adding the protons(atomic number) to the number of neutrons in that isotope.

jarptica [38.1K]3 years ago

5 0

The number of nucleons in the nucleus is the atom's mass number, that being said, each isotope of a given element has a different mass number. so there isn't one single mass number for an isotope.

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Which of the following are considered pure substances?

Tanzania [10]

Element. Everything is else is a mixture, therefore not pure.

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3 years ago

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Why do northern lights appear in different colors? Because charged particles of solar wind ignite different gases in Earth's atm

Fofino [41]

Answer:

It is A. Because charged particles of solar wind ignite different gases in Earth's atmosphere.

Explanation:

Since the solar wind from the sun is too radioactive for humans (they would die), once the charged particles hit the earth's atmosphere it shows its color. Every element has its own color and once it hits the atmosphere it really starts to show.

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3 years ago

A chemical reaction was carried out by mixing 25 g of pure CaCO3 and 0.75 mole of pure HCl to give CaCl2, H2O and CO2. a. Which

Naily [24]

hola, esta pregunta es bastante difícil pero está bien, no lo sé, lo siento :) :)

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3 years ago

Name a property copper has?

Ilya [14]

Answer:

Explanation:

It is malleable, ductile, and a good conductor of electricity and heat.

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2 years ago

an unknown molecule is found to consist of 24.2% carbon by mass, 4.0% hydrogen by mass and the remaining mass is due to chlorine

Paha777 [63]

Answer:

C3 H6 Cl 3

Explanation:

C -24.2%

H - 4.0%

Cl - (100-24.2 - 4.0)=73.8 %

We can take 100g of the substance, then we have

C -24.2 g

H - 4.0 g

Cl - 73.8 g

Find the moles of these elements

C -24.2 g/12.0 g/mol =2.0 mol

H - 4.0 g/1.0 g/mol = 4. 0 mol

Cl - 73.8 g/ 35.5 g/mol = 2.1 mol

Ratio of these elements gives simplest formula of the substance

C : H : Cl = 2 : 4 : 2 = 1 : 2 : 1

CH2Cl

Molar mass (CH2Cl) = 1*12.0 +2*1.0 + 1*35.5 = 49.5 g/mol

Real molar mass = 150 g/mol

real molar mass/ Molar mass (CH2Cl) = 150 /49.5=3

So, Real formula should be C3 H6 Cl 3.

4 0

4 years ago

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