Plz help Calculate the number of moles and the number of grams of solute in each solution. 1.0 L of 0.50 M NaCl

500 mL of 2.0 M KNO3

250 mL of 0.10 M CaCl2

2.0 L of 0.30 M Na2SO4

Answer; carbon monoxide (co);

Answerit is not a renewable energy source;

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.