Enter the appropriate symbol for an isotope of calcium-42 corresponding to the isotope notation azx

Explanation:

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.

Mass number = Number of protons + Number of neutrons

Given mass number of calcium= 42

Atomic number is defined as the number of protons or number of electrons that are present in an atom.

Atomic number = Number of electrons = Number of protons

General representation of an element is given as:

where,

Z represents Atomic number

A represents Mass number

X represents the symbol of an element

Calcium is the 20th element of the periodic table with atomic number of 20 and is written as

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

the answer is c. nacl