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marta [7]
2 years ago
9

The density of lead is 11.3

Chemistry
2 answers:
brilliants [131]2 years ago
8 0
Volume = 287 - 206 
v= 81 mL 

Mass= density x volume 
m = 11.3 x 81 
m = 915.3 g



wariber [46]2 years ago
8 0

Answer:

915 g

Explanation:

The volume of lead (V) is equal to the difference between the final level of water and the initial level of water.

V = 287 mL - 206 mL = 81.0 mL

The density of lead (ρ) is 11.3 g/mL. We can find the mass of lead (m), in grams, using the following expression.

ρ = m/V

m = ρ × V

m = 11.3 g/mL × 81.0 mL

m = 915 g

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The mass fractions of a mixture of gases are 15 percent nitrogen, 5 percent helium, 60 percent methane, and 20 percent ethane wi
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Answer:

Explanation:

mass fraction N₂ : He : CH₄ : C₂H₆ : : 15 : 5 : 60 : 20

mole fraction  N₂ : He : CH₄ : C₂H₆ : : 15/28 : 5/4 : 60/16 : 20/30

mole fraction  N₂ : He : CH₄ : C₂H₆ : : .5357  : 1.25 : 3.75 : .67

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Partial pressure of N₂ = 1200 kPa  x .0877 = 105.24 kPa

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3 years ago
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Answer:

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6 0
2 years ago
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<h2><u>Answer: [OH-] = 1.3 x 10^-8</u></h2>
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