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3 years ago

Why is water a special chemical as a solid versus a liquid?

Chemistry

1 answer:

saveliy_v [14]3 years ago

4 0

Answer:

Water is a special element because it is the one main source that keeps us alive

Explanation:

Water can be solid or liquid

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A sample of hydrated tin (II) chloride (SnCl2) has a mass of 4.90 g. When it is dehydrated, it has a mass of 4.10 g. Which is th

Usimov [2.4K]

Answer:

SnCl₂·2 H₂O.

Explanation:

Relative atomic mass data from a modern periodic table:

Sn: 118.710;
Cl: 35.45;
H: 1.008;
O: 15.999.

How many moles of SnCl₂ formula units in this sample?

The first mass 4.90 grams contain both the SnCl₂ formula units and a number of water molecules. Luckily, the mass of the dehydrated salt 4.10 grams contains only SnCl₂.

Formula mass of tin (II) chloride SnCl₂:

$M(\rm SnCl_2) = 118.710 + 2\times 35.45 = 189.610\; g\cdot mol^{-1}$ .

Number of moles of tin (II) chloride SnCl₂ formula units in this sample:

$\displaystyle n(\mathrm{SnCl_2}) = \frac{m}{M} = \rm \frac{4.10\; g}{189.610\; g\cdot mol^{-1}} = 0.0216233\; mol$ .

How many moles of water molecules H₂O in this sample?

Water of crystallization exist as H₂O molecules in typical hydrated salts. The molar mass of these molecules will be:

$M(\rm H_2O) = 2\times 1.008 + 15.999 = 18.015\; g\cdot mol^{-1}$ .

The mass of water in the hydrated salt is the same as the mass that is lost when the water molecules are removed and the salt is dehydrated.

In other words,

$\begin{aligned}m(\text{Water of Hydration})&=m(\text{Hydrated Sample}) - m(\text{Anhydrous Sample}) \\ & = \rm 4.90\; g - 4.10\; g \\ &= \rm 0.80\; g\end{aligned}$ .

$\displaystyle n(\mathrm{H_2O}) = \frac{m}{M} = \rm \frac{0.80\; g}{18.015\; g\cdot mol^{-1}} = 0.0444074\; mol$ .

What's the coefficient in front of water in the formula of this hydrated salt? In other words, how many water molecules are there in the compound for each SnCl₂ formula unit?

$\displaystyle \frac{n(\mathrm{H_2O})}{n(\mathrm{SnCl_2})} = 2.05 \approx 2$ .

There are approximately two water molecules for each SnCl₂ formula unit. The formula of this compound shall thus be $\rm SnCl_2 \cdot 2H_2 O$ .

6 0

3 years ago

A 0.72-mol sample of PCl5 is put into a 1.00-L vessel and heated. At equilibrium, the vessel contains 0.40 mol of PCl3 (g) and 0

astra-53 [7]

Answer:

Equilibrium constant is 0.4

Explanation:

We propose the equilibrium:

PCl₅(g) ⇄ PCl₃(g) + Cl₂(g)

Initially 0.72 mol

We have the 0.72 moles of the PCl₅.

React x x x

X amount has reacted, so in the equilibrium we have:

0.72 - x 0.4 0.4

If we initially have 0.72 moles and we have 0.4 moles at the equilibrium, it means that 0.3 moles has been reacted.

Let's make the expression for Kc:

Kc = [PCl₃] . [Cl₂] / [PCl₅]

Kc = 0.4 . 0.4 / 0.4

Kc = 0.4

4 0

3 years ago

When water that contains a solute freezes, the solute is not typically incorporated into the crystal lattice (i.e. it is exclude

Ilya [14]

Answer:

It matters

Explanation:

Pure substance are known to have a sharp freezing point. However, the presence of solute lowers the freezing point of the solvent. The best time to measure the freezing point is when the freezing process is just beginning.

It will be an error to measure the freezing point when the part of the solution has already frozen.

8 0

3 years ago

So it can _____ ____ the egg’s exterior and enter

Dmitry_Shevchenko [17]

So it can break down the egg’s exterior and enter

8 0

3 years ago

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A solution is a mixture _____.

VARVARA [1.3K]

Answer: