Question

1. In cell B5, write the formula to find the total number of students.

A) =SUM(B2:B4)
B) =COUNT(B2:B4)
C) =AVERAGE(B2:B4)
D) =MAX(B2:B4)

2. In cell C5, write the formula to find the maximum mark score in subject1.
A) =SUM(C2:C4)
B) =COUNT(C2:C4)
C) =MAX(C2:C4)
D) =AVERAGE(C2:C4)

3. In cell E2, write the formula to find the total mark scored by Ameen.
A) =SUM(E2:E4)
B) =COUNT(E2:E4)
C) =MAX(E2:E4)
D) =AVERAGE(E2:E4)

4. In cell D5, write the formula to find the average of subject2.
A) =SUM(D2:D4)/COUNT(D2:D4)
B) =COUNT(D2:D4)
C) =MAX(D2:D4)
D) =AVERAGE(D2:D4)

Answer 1

The questions cover calculations of formula mass and molecular mass using the atomic masses of the elements present in a compound and their quantities. For NaCl, the formula mass is 58.44 amu, and for CHCl3, the molecular mass is 119.37 amu.

Step-by-step explanation:

The question refers to calculating formula mass and molecular mass from provided tables, which accompany diagrams illustrating chemical structures. Formula and molecular masses are the sums of the average atomic masses (amu) of all atoms in a molecule, taking into account the quantity of each element present.

Formula and Molecular Mass Calculation

To calculate the formula mass of a compound such as NaCl, we sum the product of the average atomic mass of each element and its quantity. For NaCl, with sodium (Na) having an atomic mass of 22.99 amu and chlorine (Cl) having an atomic mass of 35.45 amu, the compound's formula mass is 58.44 amu. Similarly, the molecular mass of CHCl3, with one carbon atom (12.01 amu), one hydrogen atom (1.008 amu), and three chlorine atoms (35.45 amu each), comes out to 119.37 amu.