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Ivahew [28]
3 years ago
8

Which statement best describes a mole ?

Chemistry
2 answers:
pentagon [3]3 years ago
5 0
<span>
It contains 6.02 mc001-1.jpg 1023 grams of sodium chloride.

It is the mass of 12 carbon atoms.

It contains 6.02 mc001-2.jpg 1023 particles of a given substance.</span>
Alex777 [14]3 years ago
3 0

It contains 6.02 1023 particles of a given substance.

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What is the empirical formula for a compound that is 31.9% potassium, 28.9% chlorine, and 39.2% oxygen?
notsponge [240]
The  empirical formula  for a compound   is KClO3

     Explanation 
 
find  the  moles of each  element
moles  = % composition/molar  mass

molar  mass of  of  potassium =39g/mol ,chlorine = 35.5 g/mol, oxygen =16 g/mol

moles  of potassium  =  31.9 / 39 = 0.818  moles
moles of  chlorine    = 28.9/35.5 = 0.814 moles
moles of   oxygen  =  39.2/  16 =  2.45  moles


find the  mole ratio  by  dividing   with  the smallest  mole = 0.814  moles

potassium = 0.818/0.814  =1  
chlorine  =  0.814/0.814 = 1
oxygen =  2.45 /0.814 =3 


the empirical  formula   is therefore = KClO3
7 0
3 years ago
Which energy change occurs during boiling?
satela [25.4K]
Heat energy is absorbed by the substance
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3 years ago
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8_murik_8 [283]
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A 350.0 ml sample of gas has a temperature of 22.7 C and a pressure of 0.914 atm. What temperature would be needed for the same
Rus_ich [418]

Answer:

Explanation:

We shall apply gas law formula

P₁ V₁ / T₁ = P₂V₂ / T₂

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1.0818 = 220 / T₂

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= - 69.64 ⁰ C

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When a molecule of nad+ gains a hydrogen atom, the molecule becomes reduced.
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The answer is true.the molecule becomes reduced.
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