3TC is a small molecule, antiretroviral medication (C8H11N3O3S). What mass (in g) of nitrogen is in 7.43*10 moles of 3TC? (Molar mass of C8H11N3O3S 229.26 gmol)

Answer 1

You can use dimensional analysis to solve this problem, but it isn't clear how many moles of 3TC you have. You have written 7.43 x 10, but the 10 has no exponent. Are we to assume this is 7.43 x 10¹ = 7 4.3 moles? I will proceed under that assumption. If the exponent is to be something else, you can re-do the calculation by substituting the appropriate number of moles.

74.3 moles 3TC x 3 moles N/mole 3TC x 14.0 g N/mol N = 3120.6 g of N = 3120 g N (to 3 sig. figs.)