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Lisa [10]
4 years ago
15

Calculate the molar enthalpy change of H2O (l) when liquid water is heated from 41.7 C to 76.2 C

Chemistry
1 answer:
yulyashka [42]4 years ago
7 0
Enthalpy change is the total heat that is absorbed or evolved in a certain reaction that is being carried in a constant pressure system. It can be calculated by the product of the specific heat of the substance ad the difference of the final temperature and the initial temperature. Molar enthalpy change is the heat evolved or absorbed per 1 mole of a substance.The specific heat of water is 4.18 J per gram of water per degree Celsius. We calculate as follows:

Molar enthalpy change = 4.18 J / g - C ( 76.2 C - 41.7 C ) ( 18.02 g / mol ) = 2598.6642 J or 2.6 kJ
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Percentage of isotopes in 35/17 Cl and 37/17 Cl with the molar mass of chlorine as 35.5g and the mass of each nucleon to be 1.00
AlekseyPX

Answer:

The abundance of 35/17 Cl is 75% and 25% of 37/17Cl

Explanation:

The molar mass of an atom is defined as the sum of the masses of each isotope times its abundance, that is:

35.5amu = 35amu*X + 37amu*Y <em>(1)</em>

<em>Where X is the abundance of the 35/17Cl and Y the abundance of 37/17 Cl</em>

<em />

As there are just these 2 isotopes and the abundances of both isotopes = 1:

X + Y = 1 <em>(2)</em>

<em></em>

Replacing (2) in (1):

35.5 = 35X + 37(1-X)

35.5 = 35X + 37 - 37X

-1.5 = -2X

X = 0.75 = 75%

And Y = 100-75% = 25%

<h3>The abundance of 35/17 Cl is 75% and 25% of 37/17Cl</h3>
4 0
3 years ago
1.80x1024 molecules of CO2 is equal to how many grams?
olga nikolaevna [1]

Answer:

131.5177 grams

Explanation:

You divide by Avogadro's number to turn it into moles then multiply by molar mass.

7 0
3 years ago
If each vitamin has <br> 0.8 grams<br> of calcium, how much calcium will <br> 2.6<br> vitamins have?
alexandr402 [8]
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aluminum conducted heat the fastest at an average of 14 seconds. ... Aluminum has the ability to absorb heat faster than copper, and when removed from the heat source, will cool faster because it is less dense than copper

7 0
2 years ago
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