<span>There is a direct correlation between the period number and the energy level for valence electrons. For example, the H and He elements, in period 1, have their outer electrons in the energy level "1". This continues down the rows: all the elements in period 2 have their principal energy level as n = 2, period 3 has n = 3, and so on.</span>
Each orbit holds a fixed number of electrons, the n=1 orbit can only hold two electrons
A. It’s known as the “universal solvent”
Answer:
a) 15.2 kJ/g
b) 1367 kJ/mol
Explanation:
<u>Given:</u>
Mass of lactic acid = 0.5865 g
Heat capacity C of calorimeter = 4.812 kJ/C
Initial temperature, T1 = 23.10 C
Final temperature, T2 = 24.95 C
<u>To determine:</u>
Heat of combustion/gram and heat/mole lactic acid
<u>Calculation:</u>
Molar mass of lactic acid = 90.08 g/mol
The heat of combustion is given as:
where C = heat capacity of calorimeter
T1 and T2 are the initial and final temperatures
a) heat of combustion per gram
b) heat of combustion per mole