Chemistry Basic Concept

A. Mass of an atom itself is in fraction
B. Atomic masses are average masses of isobars
C. Atmoic masses are average masses of isotopes proportional to their relative abundance
D. Atmoic masses are average masses of isotopes

A. 80%
B. 30%
C. 40%
D. 20%

A. 154
B. 280
C. 86
D. 300

A. 0.25
B. 0.5
C. 0.75
D. 1

A. 2.24 dm3
B. 22.4 dm3
C. 1.12 dm3
D. 112 dm3

A. oxygen
B. carbon
C. tin
D. chlorine

A. 0.18 mole
B. 0.27 mole
C. 0.24 mole
D. 0.09 mole

A. formula unit
B. empirical formula
C. molecular formula
D. formula mass

A. 280
B. 300
C. 154
D. 54

A. 6.022 x 1023 atoms of oxygen
B. 22-gram electrons
C. 6.022 x 1023 atms of carbon
D. both B. & C.