- Could someone help me with this Solids of Materials question? Thank you?

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How many moles of ions are in a solution of 7.4 moles FeCI3 in 500 mL water? I'm trying to find a compound that contains an alkaline earth metal and a polytomic ion and then finding its molar mass.? Find integers x and y such that 57x+79y=17, and 400 Total surface of human body 1.2m^2
face temp. 30degree
surrounding 20degree
what is the heat loss from body by radiation? ? ~ x + y + z = 3, x² + y² + z² = 5, x³ + y³ + z³ = 7 ➪ x⁴ + y⁴ + z⁴ = ?