Radium disintegrates at an average rate of 2.24 xx 10^13 alpha-particles per minute. Each a-particle takes up two electrons from the air and becomes a neutral helium atom. After 420 days, helium gas collected was 0.5 rnL, measured at 27°C and 750 mmHg. Calculate the Avogadro constant.

Radium disintegrates at an average rate of 2.24 xx 10^13 alpha-particl

1.	Radium disintegrates at an average rate of 2.24 xx 10^13 alpha-particles per minute. Each a-particle takes up two electrons from the air and becomes a neutral helium atom. After 420 days, helium gas collected was 0.5 rnL, measured at 27°C and 750 mmHg. Calculate the Avogadro constant.
Answer» ANSWER :`6.7 XX 10^(23)`