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3 years ago

7

The density of ice at its freezing point is 0.917 g/cm³. What is the mass of 2.5 cm³ of ice at this temperature?

2 answers:

kupik [55]3 years ago

7 0

Answer:

<h2>GradPoint Answer: 2.3</h2>

Explanation:

Mice21 [21]3 years ago

4 0

Density = mass / volume

mass = density x volume
m = 0.917 x 2.5
m = 2.29 grams

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Explanation:

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The molecular weight of a gas that has a density of 5.75 g/l at stp is __________ g/mol.

Ira Lisetskai [31]

Answer : The molecular weight of a gas is, 128.9 g/mole

Explanation : Given,

Density of a gas = 5.75 g/L

First we have to calculate the moles of gas.

At STP,

As, 22.4 liter volume of gas present in 1 mole of gas

So, 1 liter volume of gas present in $\frac{1}{22.4}=0.0446$ mole of gas

Now we have to calculate the molecular weight of a gas.

Formula used :

$\text{Moles of gas}=\frac{\text{Mass of a gas}}{\text{Molecular weight of a gas}}$

Now put all the given values in this formula, we get the molecular weight of a gas.

$0.0446mole=\frac{5.75g}{\text{Molecular weight of a gas}}$

$\text{Molecular weight of a gas}=128.9g/mole$

Therefore, the molecular weight of a gas is, 128.9 g/mole

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3 years ago

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