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ZanzabumX [31]
3 years ago
11

What is the mass of 0.50 moles of Na? 11 grams 46 grams 3.0 × 1023 grams 6.0 × 1023 grams

Chemistry
2 answers:
Korolek [52]3 years ago
7 0

n= mass ÷ molar mass

mass= n × molar mass

=0.50 × 23

=11.5 grams

Nikitich [7]3 years ago
7 0

Answer : The mass of 0.50 moles of Na is, 11 grams

Explanation : Given,

Moles of Na = 0.50 mole

Molar mass of Na = 22.99 g/mole

Formula used :

n=\frac{w}{M}

where,

n = number of moles of Na

w = mass of Na

M = molar mass of Na

Now put all the given values in this formula, we get the mass of Na.

0.50mole=\frac{w}{22.99g/mole}

w=11.4g\approx 11g

Therefore, the mass of 0.50 moles of Na is, 11 grams

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Which of the following could happen when infrared radiation is absorbed by a molecule ?
Leto [7]

Answer:

       E) Intramolecular bond angles change

Explanation:

Infrared Radiation:

IR is electromagnetic radiations. The wavelength i.e. 700nm to 1000 mm of infrared is longer than invisible light and Its frequency is lower than light, that's why it is invisible to light.

  • When IR radiation strike the molecule it absorbed by this molecule.
  • This radiation used to identify and study chemicals.
  • Infrared radiation interact with intra-bonds of the molecule.
  • Bonds in the molecules have vibrational translational and rotational movements
  • Due to these vibration, rotation and translation movement it absorb a radiation of specific frequency and wavelength
  • These movements of bond are very small and absorbs radiations of very low frequency
  • So when Infrared light or radiation absorbed the intra-bonds of the molecule get affected and angles of these bonds changes.
  • As the frequency of the absorbed radiation matches the frequency of the bond that vibrates.

So

The correct option is option E

       E) Intramolecular bond angles change

* Note:

it couldn't be option A as the frequency of IR is not enough to rotate a whole molecule

It Couldn't be option B as IR rations are electromagnetic radiation of longer wave length so it one can not see it with light so how it will glow a molecule

It also not could be the option C as for the excitation of electrons require much higher energy.

It also not the option D as nuclear magnetic spin is associated with nuclear magnetic radiation that are much different from IR.

4 0
3 years ago
What is true about radioactive isotopes of an atom?
jenyasd209 [6]

Answer:

#2: They break down quicker than stable isotopes. - im not sure

Explanation:

6 0
2 years ago
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What is the difference between a theory and a law?​
kondaur [170]

Answer:

theory is diffrent from law

Explanation:

a Theory can never be proven to be true nd a law can usually be expressed

3 0
3 years ago
What are the charges on barium and fluorine in barium fluoride? 1 point Captionless Image Barium is +2 and fluorine is -2. Bariu
user100 [1]

Answer: Barium is +2, Fluorine is -1

Explanation:

The charge of barium is +2, and the charge of fluorine is -1. You can determine this from the periodic table groups.

The formula for barium fluoride is thus BaF2.

8 0
3 years ago
Using the following equation for the combustion of octane calculate the heat associated with the formation of 100.0 g of carbon
natali 33 [55]

Answer:

The right solution is "-602.69 KJ heat".

Explanation:

According to the question,

The 100.0 g of carbon dioxide:

= \frac{100.0 \ g}{114.33\  g/mole}

= 0.8747 \ moles

We know that 16 moles of CO_2 formation associates with -11018 kJ of heat, then

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