Mole Worksheet Use two decimal places for the molar masses and report your answer to the correct number of significant figures. I. Calculate either the number of grams or the number of moles. 1) 3.00 mol NH3 2) 9.02 mol H2O 3) 0.2000 mol SO3 4) 0.0106 mol NO2 5) 6.0 mol MgCl2 6) 12.7 g I2 7) 8.00 g NaOH 8) 5.657 g H2SO4 9) 32 g KNO3 Worksheets > Math > Grade 6 > Place Value & Sc. Notation > Write #'s in scientific notation. Math worksheets: Write whole numbers in scientific notation. Below are six versions of our grade 6 math worksheet on writing numbers in scientific notation. All numbers are whole numbers (no fractional parts) with up to 9 digits.