The constant variable is the math problems, the dependent variable is the calculators, and the independent variables are the students
Ignore this its not the anwser 2.7g
Answer:The physical changes that are endothermic are melting, vaporization and sublimation.
Explanation:
Answer: Half-life of the substance is 16 years.
Explanation:
Expression for rate law for first order kinetics is given by:
where,
k = rate constant
t = age of sample = 48 years
a = initial amount of the reactant = 240 micrograms
a - x = amount left after decay process = 30 microgarms
b)
of reaction
Thus half-life of the substance is 16 years.