By reaction between 25 g of heterogeneous aluminum, zinc and copper mixture and sodium hydroxide solution, 9.73 dm3 of hydrogen is released at STP conditions. By reaction between hydrocloric acid and 20 g of newly formed sample, 14.48 dm3 of hydrogen is released. Determine the mass of aluminum, zinc and copper in heterogeneous mixture given.
I don't really know even which reactions would take place here. That's the main problem. I apologize for translation which is probably not at high level but I did my best. Would appreciate your *delete me*