Recycled r134a refrigerant cannot exceed what levels of contaminants

1 answer:

7 0

Answer is:
1) lubricant - 500 ppm by weight.
2) moisture - 50 ppm by weight.
3) non-condensable gases (air) - 150 ppm by weight.
Standard J2099 specific the maximum levels of contaminants for R134a.
ppm<span> (parts-per-million, </span>10⁻⁶) is <span>value that represents the part of a whole number in units of 1/1000000.</span>

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How many moles of AgCl2 are in 5.78x1024 molecules of AgCl2?

Zolol [24]

Answer:

9.6 mol AgCl2

Explanation:

You have to use Avogadro's number: 6.023 x 10^23

5.78 x 10^24 molecules (1 mol AgCl2/ 6.023 x 10^23 molecules) =9.6 mol AgCl2

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3 years ago

How many of the following postulates of Dalton's atomic theory are still scientifically accepted? I. All atoms of the same eleme

Neko [114]

<h2>The required "options are (II), (III), and (IV)".</h2>

Explanation:

Postulates of Dalton's atomic theory which are scientifically accepted are:

Atoms are indestructible.
Compounds are combinations of different atoms.
A chemical reaction changes the way atoms are grouped together.

Postulates of Dalton's atomic theory which are not accepted scientifically are:

All atoms of the same elements are identical.

The theory states that the atoms of the same element are identical in every aspect but it is now scientifically proved that the same element should differ in their mass which is known as isotopes.

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3 years ago

Write the chemical equation that represents the process of lattice energy for the case of nacl.

faust18 [17]

Answer: $Na^+(g)+Cl^-(g)\rightarrow NaCl(s),\Delta H_{Lattice}=-786kJ/mol$

Explanation:

Lattice energy : It is defined energy released when ions combine together in a gaseous phase to form a compound. it is energy possessed by the crystal lattice of a compound. Denoted by symbol $\Delta H_{Lattice}$ .