Question

Gram molecules in 43.1 g of c2h5oh

Answer 1

Answer:

0.936 GRAM MOLECULE

Explanation:

MOLECULAR MASS=2×12+5×1+16+1=24+5+17=46u

now

molecular mass=mass of 1 mol of that molecule=

mass of 1 gram molecule of that substance

mass of 1 gram molecule of a substance is measured in grams and mass of 1 gram molecule

of a substance is its gram molecular mass(GMM)

no of gram molecules=given mass/GMM

molecular mass of C2H5OH =46u

mass of 1 gram molecule of c2h5oh is 46g

so it is the gram molecular mass of C2H5OH

no of gram molecules =43.1/46=0.936 gram molecules of C2H5OH

NOTE:

MASS OF 1MOL OF MOLECULE=

MOLECULAR MASS OF THE SUBSTANCE=GRAM MOLECULAR MASS

OF THAT SUBSTANCE

MASS OF 1 GRAM MOLECULE OF A MOLECULE

IS KNOWN AS ITS GRAM MOLECULAR MASS