Answer
340 torr = 0.447 atm
540 mmHg = 0.711 atm
21 psi = 1.43 atm
Step-by-step explanation
Conversion factor:
1 atm = 760 torr
1 atm = 760mmHg
1 atm = 14.6959 psi
Therefore;
760 torr = 1 atm
340 torr = x atm
x = (340 torr/760 torr) x 1 atm = 0.447 atm
340 torr = 0.447 atm
760 mmHg = 1 atm
540 mmHg = x atm
x = (540 mmHg/760 mmHg) x 1 atm = 0.711 atm
540 mmHg = 0.711 atm
1 atm = 14.6959 psi
x atm = 21 psi
x = 21 psi/14.6959 psi) x 1 atm = 1.43 atm
21 psi = 1.43 atm