The mass of one molecule of a substance is 11 . 79 × 10 - 26 kg . Calculate its molar mass? What could this substance be?

Given mass m = 11 . 79 × 10 - 26 kg = 11 . 79 × 10 - 26 × 1000 g = 11 . 79 × 10 - 23 g Number of molecules, N = 1 Molar mass, M = ? Now, N = m M × N 0 So, M = m × N 0 N = 11 . 79 × 10 - 23 × 6 . 022 × 10 23 1 M = 70 . 997 gmol - 1 = 71 gmol - 1 This is the molecular mass of chlorine. So, the substance is chlorine Cl 2 .

The mass of one atom of an element X is 2 . 0 × 10 - 23 g . Calculate the atomic mass of element X .

Given, 1 atom of element X Mass, m = 2 × 10 - 23 g . Now using the following formula we can calculate the atomic mass of X : N = m M × N 0 ⇒ M = m × N 0 N ⇒ M = 2 × 10 - 23 × 6 . 022 × 10 23 1 = 12 . 044 Therefore, the atomic mass of element X is 12 . 044 u .

The mass of one atom of an element X is 2 . 0 × 10 - 23 g . What could element X be?

Given, 1 atom of element X Mass, m = 2 × 10 − 23 g Now using the following formula we can calculate the atomic mass of X : N = m M × N 0 ⇒ M = m N × N 0 ⇒ M = 2 . 0 × 10 - 23 1 × 6 . 022 × 10 23 = 12 . 044 Therefore, the atomic mass of element X is 12 . 044 u . From the atomic mass calculated and comparing it with the mass of the elements, it is seen that the element X is carbon