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aivan3 [116]
3 years ago
14

The concentration of gallium in silicon is 5.0 × 10−7 at%. What is the concentration in kilograms of gallium per cubic meter?

Chemistry
1 answer:
Step2247 [10]3 years ago
3 0

Answer:

[ Ga ] = 1.163 E-8 Kg/m³

Explanation:

  • %wt = [(mass Ga)/(mass Si)]*100 = 5.0 E-7 %

⇒ 5.0 E-9 = m Ga/m Si

assuming: m Si = 100 g = 0.1 Kg

⇒ m Ga = (5.0 E-9)*(0.1 Kg) = 5 E-10 Kg

∴ density (δ) Si = 2.33 Kg/m³

⇒ Volume Si = (0.1 Kg)*(m³/2.33 Kg) = 0.043 m³

⇒ [ Ga ] = (5 E-10 Kg)/(0.043 m³) = 1.163 E-8 Kg/m³

⇒ [ Ga ] =

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Explanation:

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3 years ago
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3 years ago
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Answer:

15.0 µm

Step-by-step explanation:

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m = 1.091 g

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(b) <em>Thickness of foil </em>

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V  = lwh                            Divide each side by lw

h = V/(lw)

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   = 0.015 mm                  Convert to micrometres

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4 0
3 years ago
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