Final answer:
To determine how much of the radioactive substance will remain 2 years from now, we need to consider the substance's half-life. Although the problem does not provide the half-life, we can explain that less than 4 grams would remain.
Step-by-step explanation:
To determine how much of the radioactive substance will remain 2 years from now, we need to consider the half-life of the substance. The half-life is the time it takes for half of the substance to decay.
Since the problem does not provide the half-life of the substance, we cannot calculate the exact amount that will remain. However, we can use the concept of half-life to explain that after 2 years, a portion of the substance will decay, leaving a smaller amount remaining.
For example, if the half-life of the substance is 1 year and there were initially 6 grams, after 1 year, only 3 grams would remain. After another year, half of the remaining 3 grams would decay, leaving approximately 1.5 grams. Therefore, after 2 years, it is likely that less than 4 grams would remain.