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Galina-37 [17]
3 years ago
12

a small cube of aluminum measures15.6mm on a side and weights 10.25g. What is the density of aluminum in g/cm3

Chemistry
1 answer:
astraxan [27]3 years ago
7 0
M - mass: 10,25g
V - volume: 1,56³[cm] = 3,796 cm³
d - density: ??
--------
d = m/v
d = 10,25/3,796
d = 2,7 g/cm³

:)
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What are the molality and mole fraction of solute in a 22.3 percent by mass aqueous solution of formic acid (HCOOH)?
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Answer:

Mole fraction for solute = 0.1, or 10%

Molality = 6.24 mol/kg

Explanation:

22.3% by mass → In 100 g of solution, we have  22.3 g of HCOOH

Mass of solution = 100 g

Mass of solute = 22.3 g

Mass of solvent = 100 g - 22.3g = 77.7 g

Let's convert the mass to moles

22.3 g . 1mol/ 46 g = 0.485 moles

77.7 g. 1mol / 18 g = 4.32 moles

Total moles = 4.32 moles + 0.485 moles = 4.805 moles

Xm for solute = 0.485 / 4.805 = 0.100 → 10%

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77.7 g.  1 kg / 1000g = 0.0777 kg

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6 0
3 years ago
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Nimfa-mama [501]

Answer:

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Explanation:

Given data:

Number of molecules of sucrose = 8.1 ×10²¹ molecules

Mass of sucrose = ?

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1 mole × 8.1 ×10²¹ molecules / 6.022×10²³ molecules

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Mass = number of moles × molar mass

Molar mass = 342.3 g/mol

Mass = 1.35 × 10⁻² mol ×342.3 g/mol

Mass = 462.1  × 10⁻² g

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3 years ago
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3 years ago
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Alex787 [66]

Answer:

the copper would melt at the same temperature no matter how much quantity there is so 1085

Explanation:

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2 years ago
What is the molarity of a solution containing 9.0 moles of solute in 2500 ml of a solution​
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