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क्यूप्रस और क्यूप्रिक ऑक्साइड के एक मिश्रण में 88 % ताम्बा है| यदि ताम्बें का परमाणु भार 64 हो तो मिश्रण में दोनों यौगिकों की प्रतिशत मात्रा निकालें|

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मान लें की ` Cu_2O =x%` और `CuO =y%`
` " " x+ y= 100" " ....(1) `
` " "Cu_2 O ` में `Cu =(128)/( 144)x`
` " " Cu O ` में ` Cu = ( 64 )/(80)y,`
` therefore " "*(128)/( 144)x+ (64)/( 80)y =88`
या ` " "(8)/(9) x+ ( 4)/(5) y =88`
या ` " " x+ ( 9)/(10) y= 99" "...(ii)`
समीकरण (i ) में (ii ) को घटाने पर
` " " y= 10 `
अर्थात ` " "CuO =10%`
और ` " "Cu _2O =100-10 =90%`

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