Question

What is the composition of gases in the tanks used by the scuba divers?

• A. $11.7 \%$ helium $32.1 \%$ nitrogen $56.2 \%$ oxygen
• B. $11.7 \%$ helium $56.2 \%$ nitrogen $32.1 \%$ oxygen
• C. $56.2 \%$ helium $11.7 \%$ nitrogen $32.1 \%$ oxygen
• D. $56.2 \%$ helium $32.1 \%$ nitrogen $11.7 \%$ oxygen

Answer 1

Answer: (B)

Air diluted with helium, i.e. a mixture of $11.7 \%$ helium,
$56.2 \%$ nitrogen and
$32.1 \%$ oxygen, is present in the tanks used by scuba divers for respiration.