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Contact [7]
3 years ago
15

A solution is made by dissolving

Chemistry
1 answer:
ipn [44]3 years ago
7 0

Answer:

2.21m

Explanation:

Molality, m, is defined as the ratio between moles of solute (The substance that is in less amount, sodium sulfide) and kilograms of solvent (Water, in this case).

Thus, we need to convert mass of sodium sulfide to moles using its molar mass and grams of water to kilograms:

<em>Moles Na2S (Molar mass: 78.0452g/mol):</em>

37.5g * (1mol / 78.0452g) = 0.48 moles Na2S

<em>Kilograms water:</em>

217g * (1kg / 1000g) = 0.217kg

Molality:

0.48 moles Na2S / 0.217kg =

<h3>2.21m</h3>
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Answer:

The Pressure Temperature Law. This law states that the pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature. With an increase in temperature, the pressure will go up.

Explanation:

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When an irregular shaped object was put in a graduated cylinder with an initial volume of 25 mL of water, the water level rose t
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Answer:

0.24 g/mL

Explanation:

The density of an object is given by the ratio between its mass and its volume:

\rho=\frac{m}{V}

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In this problem, we have:

m = 7.0 g is the mass of the object

The volume of an irregular shaped object can be measured by putting it into water, and by measuring the difference in water volume.

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So the volume of the object is

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Therefore, the density of the object is:

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3 years ago
The force of gravity depends on the distance between objects true or falue
OLEGan [10]

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What happens when a substance undergoes a physical change? Some physical properties change, but the substance keeps its identity
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Some physical properties change, but the substance keeps its identity.

When dealing with these kind of questions, understand that the keyword here is physical change. Thus, all options that says no physical properties change are WRONG. So this leaves us with only 2 answers left. However, this is a physical change, no chemical change. Thus, the substance will keep its identity and not change.

8 0
3 years ago
Read 2 more answers
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