Question

What is 1 Dalton?

(a) a unified mass unit, 1.360539040(20)×10^−27kg

(b) a unified mass unit, 1.640539040(20)×10^−27kg

(c) a unified mass unit, 1.660539040(20)×10^−27kg

(d) a unified mass unit, 1.660539040(20)×10^−27kg

The question was asked in unit test.

Question is from Dalton’s Atomic Theory in portion Chemistry Basic Concepts of Chemistry – Class 11

Answer 1

The correct choice is (d) a unified mass unit, 1.660539040(20)×10^−27kg

For explanation: Dalton is also known as the unified mass unit that is equal to 1.660539040(20)×10^−27kg or 931.4940954(57)MeV/c^2 or 1822.888486192(53)me (symbol: u, or Da or AMU). It’s a standard unit of mass on the molecular and atomic scale.