D.
The volume of water in a graduated cylinder
should be read at the bottom of the curve of the meniscus.
D= M/V so, D=300/40 wich is 7.5 so D= 7.5g/m3
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
= 1.0027 kJ
Molar mass of KBr = 119 g/mol
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
=19.89 kJ/mol
Heat is released therefore, sign will be negative.
Molar heat enthalpy of KBr = -19.89 kJ/mol
Answer:

Explanation:
Hello!
In this case, since we can see that the heat released by the combustion of the mayonnaise is absorbed by the bomb calorimeter and water, we can set up the following equation:

Whereas q for mayonnaise stands for the heat due to its usage; thus, we plug in to obtain:

Now, if 10.0 g are eaten, the energy provided by it turns out:

And we need that value in dietary calories, 1 kcal:

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Answer: A. Salt in the Dead Sea is saltier