- Why does an impurity reduce the melting point range of a pure compound?

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Could a black hole exist within the event horizon of a bigger black hole? I'm trying to find a compound that contains an alkaline earth metal and a polytomic ion and then finding its molar mass.? Why is always a problem in recent years, aircraft, whether artificially or incidents? 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)? 6g of Mg in 16g of O2 are burnt. Calculate mass of MgO formed.?