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3 years ago

Which aqueous solution has the lowest freezing point c6h12o6, c2h5oh, ch3cooh, or nacl?

1 answer:

3 0

Depression of a freezing point of the solutions depends on the number of particles of the solute in the solution.
1 mol of C6H12O6 after dissolving in water still be 1 mol, because C6H12O6 does no dissociate in water.
1 mol of C2H5OH after dissolving in water still be 1 mol, because C2H5OH does no dissociate in water.
1 mol of NaCl after dissolving in water gives 2 mol of particles (ions), because NaCl is a strong electrolyte(as salt) and completely dissociates in water.
NaCl ----->Na⁺ + Cl⁻
1 mol of CH3COOH after dissolving in water gives more than 1 mol but less than 2 moles, because CH3COOH is a weak electrolyte (weak acid) and dissociates only partially.

So, most particles of the solute is going to be in the solution of NaCl,
so the lowest freezing point has the aqueous solution of NaCl.

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The number of grams of H2 in 1470 mL of H2 gas.

Lorico [155]

Answer:

0.1313 g.

Explanation:

It is known that at STP, 1.0 mole of ideal gas occupies 22.4 L.

Suppose that hydrogen behaves ideally and at STP conditions.

Using cross multiplication:

1.0 mol of hydrogen occupies → 22.4 L.

??? mol of hydrogen occupies → 1.47 L.

∴ The no. of moles of hydrogen that occupies 1.47 L = (1.0 mol)(1.47 L)/(22.4 L) = 6.563 x 10⁻² mol.

Now, we can get the no. of grams of hydrogen in 6.563 x 10⁻² mol:

The no. of grams of hydrogen = no. of hydrogen moles x molar mass of hydrogen = (6.563 x 10⁻² mol)(2.0 g/mol) = 0.1313 g.

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3 years ago

Need these 2 answered asap pls

Kitty [74]

Answer:

im not a brain wiz but i think 20

Explanation:

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3 years ago

Which of the following brain waves is associated with a deep sleep?

natta225 [31]

Delta waves are associated with a deep sleep~

3 0

3 years ago

Read 2 more answers

What is occurring when reactants are mixed and heated and liquid collects in the sidearm of the apparatus

olga55 [171]

When reactants are mixed and heated and liquid collects in the sidearm of the apparatus, a chemical reaction is occurring.

<h3>What is a chemical reaction?</h3>

A chemical reaction is said to occur when reactants are combined to form products. We must note that the formation of products is evidenced by;

Appearance of a liquid
Appearance of a gas
Appearance of a solid

Hence, when reactants are mixed and heated and liquid collects in the sidearm of the apparatus, a chemical reaction is occurring.

Learn more about chemical reaction:brainly.com/question/22817140

#SPJ1

4 0

2 years ago

The density of iron is 7.8 g/cm3 and that of aluminum is 2.7 g/cm3. Using a balance, you find that a block of iron has the same

vazorg [7]

Answer:

1.The Aluminum block

2.its surroundings absorb energy from it.

Explanation:

In this question it is important to remember that density of an object is the mass of that object divided by its volume.

The expression applied here is density=mass/volume

Given that the mass is constant,lets say mass= m=1g

and density of aluminum=2.7g/cm³ and that of iron is 7.8 g/cm³ then volume=?

Volume=mass/density

Volume of aluminum= 1/2.7 =0.3704 cm³

Volume of iron = 1/7.8 =0.1282 cm³

Here we see volume of Aluminum block is the largest.

2.As water in an ice cube tray freezes, its surroundings absorb energy from it.When the water freezes, latent heat of freezing is given out to the surrounding.When water is freezing, it stays at a constant temperature of 0°C, the heat energy released ensures that there is no cooling past 0 °C.

8 0

3 years ago