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Dmitriy789 [7]
3 years ago
13

How many moles of NaCl are in 75.0 g of NaCl ?

Chemistry
2 answers:
LenaWriter [7]3 years ago
6 0
Number of moles is found by formula n=mass/molar mass, or m/M. the molar mass is found by adding together the atomic masses of Na and Cl (22.99 + 35.45) to give 58.44 g/mol. Since the mass of NaCl is 75.0g, we find the number of moles as follows:
n = 75.0 / 58.44 = 1.28 mol
Mkey [24]3 years ago
6 0
To find the number of moles of any compound you should divide the mass over the molar mass of that compound 

<span>so for your question, </span>

<span>number of moles = mass/ molar mass </span>
<span>= 75.0 g / 58.443 g/mol </span>
<span>= 1.2833 </span>
<span>= 1.28 and note that the answer is rounded to 3 significant figures</span>
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LuckyWell [14K]

Answer:

a) Neutralisation

b) Combustion

c) Synthesis

d) Decomposition

e) Neutralisation

f) Double Displacement Reaction

h) Single Displacement Reaction

i) Double Displacement Reaction

j) Combustion

Explanation:

Synthesis  is a reaction where various compounds/ elements react to form a totally new compound.

Decomposition is a reaction where a single compound breaks down into several components due to excessive heating or energy applied.

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Double Displacement Reaction is a type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products.

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5 0
3 years ago
Which of the following elements is represented by the above graphic​
kolezko [41]

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An atom of argon has a radius rar = 88 pm and an average speed in the gas phase at 25°C of 172 m/s.
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Answer:

1.2* 10³ rNe.

Explanation:

Given speed of neon=350 m/s

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4π

h

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6.22∗10

−23

20∗10

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=3.35∗10

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kg

substituating the values in eq. (1)

Δx =4.49*10^{-8}10

−8

m

In terms of rNe i.e 38 pm= 38*10^{-12}10

−12

Δx=\frac{4.49*10^{-8} }{38*10^{-12} }

38∗10

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4.49∗10

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=0.118*10^{4}10

4

* (rNe)

=1.18*10³ rN

= 1.2* 10³ rNe.

Explanation:

This is the answer

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