The green and black symbols refer to atoms, that make up the molecule of water, more specifically you can say that the 2 Hydrogen atoms are the black ones found outside, while the central atom, that is also green would be oxygen.

5 0

2 years ago

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In a calorimetry experiment, a salt is dissolved in water within an insulating container. The temperature of the solution (surro

Stels [109]

Answer:

Explanation:

heat released by the solution

= 120 x 3.18 x ( 25 - 14 )

= 4197.6 J

= 4.1976 kJ

This is the heat gain by the salt

so enthalpy change = + 4.1976 kJ

because there is increase in enthalpy

It is endothermic process .

7 0

2 years ago

The mole fraction of NaCl in an

posledela

The weight/weight percent(%w/w) of NaCl in solution : 33.03%

<h3>Further explanation</h3>

Given

Mole fraction of NaCl : 0.132

Required

The weight/weight percent of NaCl

Solution

1 mol solution : 0.132 mol NaCl + 0.868 mol H₂O

mass NaCl :

$\tt 0.132\times 58.44 g/mol=7.714~g$

mass H₂O :

$\tt 0.868\times 18.016~g/mol=15.64~g$

Total mass = 7.714 + 15.64 = 23.354 g

$\tt \%NaCl=\dfrac{7.714}{23.354}\times 100\%=33.03\%$

6 0

3 years ago