and we had to round this was the question was to again
calculate the number of moles in each of the following masses
a)64.1 g of aluminum
b)28.1 g of silicon
c)0.255 g of sulfur
d)850.5 g of zinc
a) 64/27 = 2.4 mols b) 28.1g/28=1.0 mol c) 0.255/32=.0080 d)850.5/65 =13.076. I think i made some mistakes can u see if im on the right track or correct me if im wrong.. thanks in advance
also the answer has to be rounded and written in scientific notation form which ive failed and need help
To calculate the number of moles in each of the given masses, you need to use the molar mass of the respective element or compound. The molar mass is the mass of one mole of a substance expressed in grams.
Let's go through each calculation step-by-step:
a) Aluminum (Al) has a molar mass of 27 g/mol. Therefore, you can calculate as follows:
number of moles = mass / molar mass
number of moles = 64.1 g / 27 g/mol
number of moles ≈ 2.37 moles (round to the appropriate number of significant figures)
b) Silicon (Si) has a molar mass of 28 g/mol. So, you can calculate as follows:
number of moles = mass / molar mass
number of moles = 28.1 g / 28 g/mol
number of moles = 1 mol
c) Sulfur (S) has a molar mass of 32 g/mol. The calculation is:
number of moles = mass / molar mass
number of moles = 0.255 g / 32 g/mol
number of moles = 0.00796875 moles (round to the appropriate number of significant figures)
d) Zinc (Zn) has a molar mass of 65 g/mol. So, you can calculate as follows:
number of moles = mass / molar mass
number of moles = 850.5 g / 65 g/mol
number of moles ≈ 13.084 moles (round to the appropriate number of significant figures)
After reviewing your calculations, it seems you made a few rounding errors. The corrected values are shown above. Remember to round your answers to the appropriate number of significant figures based on the least precise value given in the question or based on the desired level of precision.