Question

An alloy is to contain copper and zinc in the ratio 9:4 the zinc require to be melted with 24 kg of copper is

Answer 1

Answer:

11 kg

Explanation:

Copper : Zinc = 9 : 4

Copper melted = 24 kg

Zinc melted = x kg

9 / 4 = 24 / x

9x = 24*4

9x = 96

x = 96 / 9

  = 32 / 3

  = 10.66666....

  ≈ 11 kg

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Answer 2

Answer:Cu4 Ag3 Au

Explanation:

For copper-

CCP lattice has atoms at=

face centre+corners

= 1/2×6 +1/8×8

=3+1 = 4

For silver-tongued

Edge centre= 1/4× 12 = 3

For gold-plated

Body centre=1×1

=1

Therefore,

Formula=Cu4 Ag3 Au