What mass (in kg) does 4.41 moles of copper have?     0.784 kg     0.444 kg     0.280 kg     0.820kg     0.018 kg

28) Determine the mass of the following compound: 0.0146 mol KOH A) 56.11 g B) 0.819 g C) 8.19 g 29) Determine the mass of the following compound: 1.6 x 10-3 mol NaSO, A) 2.3 g B) 0.23 g C) 142.04 g 30) Diamond is one form of elemental carbon. An engagement ring contains a diamond weighing 1.25 carats (1 carat = 200 mg). How many atoms are present in the diamond? A) 1.25 × 1022 B) 1.25 x 1020 C) 0.250

2CUO (s) + C (s) → 2Cu (s) + CO; (8} If the student starts with 5.00 g of Carbon (C) how many grams of copper metal (Cu) can she produce? O None of these 26.7 g Cu 50.0 g Cu 5.00 g Cu O53.3 g Cu

How many grams of O2 are needed to form 7.35moles of Fe2O3? 4 Fe + 302 → 2 Fe203 Round your answer to 2 decimal places and, if needed, enter scientific notation like this 6.02e23 (would mean 6.02 x 1023.)