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olganol [36]
2 years ago
11

Which of the following lists elements from lowest to highest atomic number?

Chemistry
1 answer:
Solnce55 [7]2 years ago
5 0

Answer:

The last option  V, Rh, Sn

Explanation:

Look at the periodic table.  Atomic weight increases going from left to right and progressing downward in the table.

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When a 6.00 g sample of KBr is dissolved in water in a calorimeter that has a total heat capacity of 2.71 kJ ⋅ K − 1 , the tempe
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Answer:

Molar heat enthalpy of KBr = -19.89 kJ/mol

Explanation:

Change in temperature (Δt) = 0.370 K

Heat capacity = 2.71 kJ ⋅ K^-1

Heat absorbed by calorimeter = heat capacity × change in temperature

                                               = 2.71× 0.370

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No. of moles of KBr = 6.00/119

                               = 0.0504 mol

Heat absorbed by the calorimeter is given by KBr.

Now calculate the heat released by per mol of KBr as follows:

Heat released by per mol of KBr = 1.0027 kJ / 0.0504 mol

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Molar heat enthalpy of KBr = -19.89 kJ/mol

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