Relative Atomic Mass and Relative Molecular Mass

Why carbon-12 is chosen as refference standard relative atomic mass and relative molecular mass?

• Carbon has 3 isotope

• Carbon is a non metal

• Carbon is a solid and easily to be handle

• Carbon is located at group 14 in the periodic table

Eight atom of element X has same mass as two atom of Tellurium. What is the relative atomic mass of X [RAM Tellurium : 128]

• 8

• 16

• 32

• 64

The average mass of magnesium is 24 times greater than 1/2 mass of carbon -12. what is the relative atomic mass of magnesium

• 2

• 12

• 16

• 24

Tags

NGSS.HS-PS1-7

The chemical formula of potassium hexacyanoferrate (III) is K₃Fe(CN)₆. What is the relative formula mass?

RAM [ K=39, Fe=56, C= 12, N= 14]

• 121

• 199

• 251

• 329

The mass of 3 atom of X is equal to the mass of four carbon atoms. X is not the actual symbol of element. What is the relative atomic mass of X?

• 48

• 36

• 16

• 12

• 27

• 54

• 117

• 123

Tags

NGSS.HS-PS1-7