Question

Which one of the following indicates the value of the gas constant R.

• A. 1.987 cal K^–1 mol^–1
• B. 8.3 cal K^–1 mol^–1
• C. 0.0821 lit K^–1 mol^–1
• D. 1.987 Joules K^–1 mol^–1

Answer 1

Answer: (A)

1.987 cal K^–1 mol^–1

Answer 2

8.31 J.K^-1 mol^–1

1 cal = 4.2 J.

$6.02 \times 10^{22}$ = 1.987 cal K^–1 mol^–1