Complete the following table for neutral atoms: Name of Element Symbol Atomic Number Mass Number Number of Protons Number of Neutrons Number of Electrons N 15 Calcium 42 38 50 14 16 56 138 Part A Complete the first column of the table. Express your answers as strings separated by commas. Enter your answers in order given in the table. Miss cells that are already filled.

distance, luminosity, brightness, radius, chemical composition, and temperature

6.4 cm (max) - 25 cm (min)

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol