Final answer:
To find the natural abundance of Si-30, consult a reference table or source for isotopic distribution. Calculate the atomic mass of Si-30 by considering the masses and abundances of isotopes.
Step-by-step explanation:
The natural abundance of Si-30 refers to the percentage of Si-30 isotopes found in a sample of silicon. To find the natural abundance, you would need to consult a reference table or source that provides information on the isotopic distribution of silicon. Once you have the percentage, you can express the natural abundance of Si-30 using two significant figures.
To calculate the atomic mass of Si-30, you would need to consider the mass of each isotope present and its corresponding natural abundance. The atomic mass is the weighted average of the masses of the isotopes, taking into account their abundances. Again, consult a reference table or source to find the isotopic masses and natural abundances of silicon isotopes. Calculate the weighted average using the percentages and masses to determine the atomic mass of Si-30.