- Can u tell me the average number for the set of 19, 15, 11 ,-3, -7?

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How many moles of ions are in a solution of 7.4 moles FeCI3 in 500 mL water? 6g of Mg in 16g of O2 are burnt. Calculate mass of MgO formed.? A reaction produced 52.1 g of kcl how much o2 was produced in grams? If 5sinθ = 3 determine the value of:
1. cos (θ-360)
2. Tan (squared)θ
3. Sin θ x cos θ (all divided by cos (squared θ)? What town is this prefix number for 869 ?