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Oxygen is a non meta element. Atomic mass of it is 16.
The relative atomic mass of hydrogen is 1 and for oxygen it's 16. This gives water (which has the formula H2O) a molecular mass of 18.
There are many compounds with a relative mass of 72.Eg. pentane (C5H12), methyl butane (CH3)-(C4H9), dimethyl propane (CH3)2-(C3H6). Inorganic formula's can not easily be guessed, but undoubtly be found.Only one (isotope of an) element has the relative mass of 72: Gallium, (Ga-72), but this is not a natural, stable isotope. Gallium has not a molecular formula (being a metal like aluminum) only an atomic symbol: Ga.
relative atomic mass
All elements have an atomic mass relative to 12C having a mass of 12.
relative formula mass of MgCO3
The relative formula mass of a molecule of hydrgoen is two (2 x 1).
55
46.068g
Benzene has a chemical formula of C6H6 This has a molar mass of 78. So one mole has a mass of 78 grams
The chemical formula of potassium dichromate is K2Cr2O7; and the molecular mass is 294,185.
The chemical formula is (NO3)-; the mass is 62 g.
The anhydrous copper sulfate (CuSO4) has a molar mass of 159,62.
78
(39x2)+12+(16x3)=138
136.1406 g/mol
The molar mass of benzene is 78 g.