- A reaction produced 52.1 g of kcl how much o2 was produced in grams?

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I'm trying to find a compound that contains an alkaline earth metal and a polytomic ion and then finding its molar mass.? Help me to solve the following question!
Find integers x and y such that 57x+79y=17, and 400 6g of Mg in 16g of O2 are burnt. Calculate mass of MgO formed.? Let X1 & X2 have joint pmf p(x1, x2)=(x1x2)/36. 0 otherwise Find joint pmf of Y1=X1X2 and Y2=X2? Multiply matrices A and B of any sizes legally (no size compatibility requirment). What kind of matrix multiplication am I?