Question

The mean mass of 13 textbooks is 875 grams, and n novels have a total mass of 13 706 grams. Find the
mean mass of a novel, given that the textbooks and novels together have a mean mass of 716.6 grams

Answer 1

The number of neutrons is equal to the difference in the mass number and atomic number.

It is equal to 14−6=8.

(a) The number of neutrons present in 7 mg of C-14:

$=147×10−3×6.02×1023×8$

$=2.408×1021$

(b) Total mass of neutrons in 7 mg of C-14:

$2.4088×1021×1.675×10−27$

$=4.035×10−6  kg.$