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Kazeer [188]
3 years ago
8

Which material would take the longest to cool off once heated?

Chemistry
1 answer:
frozen [14]3 years ago
7 0

Answer:

Liquid water  

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Which species can conduct an electric current?<br> 1) NaOH<br> 2) NaCl<br> 3) H2O<br> 4) HCl
Stells [14]

Answer:

4) HCI

Explanation:

HCI is a strong acid.

7 0
3 years ago
The normal boiling point of ethanol (c2h5oh) is 78.3 °c and its molar enthalpy of vaporization is 38.56 kj/mol. what is the chan
kaheart [24]
When the entropy change of vaporization
       
 = enthalpy of vaporization/boiling point temperature 

when we have the enthalpy of vaporization = 38560 J/mol

and the boiling point temperature in Kelvin = 78.3 + 273 = 351.3 K

by substitution:

∴the entropy change of vaporization = 38560J/mol/351.3K

                                                               = 109.76 J/K/mol

and when the liquid has lesser entropy than the gas and we here convert from

gas to liquid so, the change in entropy = -109.76 J/K/mol

now, we need the moles of C2H5OH = mass/molar mass when the molar

mass of C2H5OH = 46 g/mol and mass = 42.2 g 

∴ moles of C2H5OH = 42.2 g / 46 g/mol = 0.92 moles

when 1 mol of C2H5OH turns in liquid entropy change →-109.76 J/K/mol

∴ 0.92 mol of C2H5OH → X

∴ X entropy change when 0.92 mol = -109.76 *0.92 mol / 1 mol

                                                             = 84.64 J/K


6 0
3 years ago
Which observation illustrates the law of conservation of mass?
const2013 [10]
The conservation of mass states that the total mass of reactants present before the reaction occurs is equal to the total mass of products after the reaction. From the choices, the second choice deems fit for the description of the law.
8 0
3 years ago
Read 2 more answers
A sample of matter was given the following description: The sample of the pure substance is blue in color with an octahedral sha
Alexeev081 [22]

Answer:

A crystalline solid

Explanation:

Most solids form with a regular arrangement of their particles because the overall attractive interactions between particles are maximized, and the total intermolecular energy is minimized, when the particles pack in the most efficient manner. The regular arrangement at an atomic level is often reflected at a macroscopic level.  Liquids dont use to have this kind of arrangements or shapes.

5 0
3 years ago
What amount of water is formed when 20 ml of 0.80 m hcl and 30 ml of 0.40 m naoh are mixed?
Yuri [45]

Answer: The amount of water formed is 12 moles

Explanation: Please see the attachments below

7 0
4 years ago
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