Antique Brass
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![]() BLESSING Harmonica Made in China with Box US $11.99
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![]() Canadian Ace Harmonica Vintage Made in Rep of Ireland Frhotz 1984 1873 1900 US $7.99
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![]() Drum With Zebra Decor and Feathers US $3.99
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![]() New Size 4 4 3 4 1 2 1 4 Flamed Ebony Violin $125 Gift US $169.98
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![]() Antique Brass Music Stand US $122.50
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![]() Cecilio 165 16 155 15 14 13 12 Ebony Viola US $159.98
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![]() 1965 COIN PICK Gretsch Slingerland Ludwig Premier Drums Tom Snare Kick Bass Ad US $4.25
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![]() BUISINE MIDIEVAL HORN HERALDS TRUMPET US $150.00
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![]() SIZE 4 4 ROSEWOOD FITTED SATIN ANTIQUE FINISH VIOLIN US $56.98
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![]() 3 4 size Violin Ebony Fitted Inlaid Purfling size Violin Ebony Tailpiece US $134.95
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![]() 4 4 size Violin Flamed Ebony Fitted Inlaid Purfling Ebony Tailpiece US $164.95
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| The Musical Instruments People |
antique brass is 30% zinc and 70% copper how many grams of antique brass can be made from 18 grams of zinc?
antique brass is 30% zinc and 70% copper how many grams of antique brass can be made from 18 grams of zinc and 37.8 grams of copper?
I don't understand please help.
30 : 70 = 18 : x
x = 42 = mass copper needed
we have only 37.8 g copper
30 : 70 = x : 37.8
x = mass Zn needed =16.2 g
so we have 18 - 16.2 g = 1.8 g of Zn in excess
mass alloy = 16.2 + 37.8=54.0 g



US $84.95
















































