Gold-198 has a half life of approximately 3 days. If a 100g sample of gold-198
decays for 9 days,
1. How many half-lives have occurred?
2. Approximately how many grams of gold-198 remain in the sample?

Consider the nuclear equation below. 239 > x + 4 he 94 2 what is x? 1.235 cm 96 2.243 u 92 3.235 u 92 4.243 cm 96

Why doesn't heat added to water make the tempature rise above 100c

22. a flask containing 450 ml of 0.50 m h2so4 was accidentally knocked to the floor. how many grams of nahco, do you need to put on the spill to neutralize the acid according to the following equation: h2so4(aq)+2 nahcos(aq) na,so(aq) +2 h20()+2 co2(g) d) 38 g a) 2.3 g b) 9.5 g c) 19 g