Which following substances is covalently bonded??

List the following aqueous solutions in order of increasing boiling point: 0.12 m C6H12O6, 0.05 m LiBr, and 0.05 m Zn(NO3)2. Exp

GalinKa [24]

Answer: The order of increasing boiling points follows:

$\text{LiBr }$

Explanation:

The expression of elevation in boiling point is given as:

$\Delta T_b=i\times k_b\times m$

where,

$\Delta T_b$ = Elevation in boiling point

i = Van't Hoff factor

$T_b$ = change in boiling point

$k_b$ = boiling point constant

m = molality

For the given options:

Option 1: 0.12 m $C_6H_{12}O_6$

Value of i = 1 (for non-electrolytes)

So, molal concentration will be = $(0.12)\times 1=0.12m$

Option 2: 0.02 m LiBr

Value of i = 2

So, molal concentration will be = $(0.02)\times 2=0.04m$

Option 3: 0.05 m $Zn(NO_3)_2$

Value of i = 3

So, molal concentration will be = $(0.05)\times 3=0.15m$

As, the molal concentration of $Zn(NO_3)_2$ is the highest, so its boiling point will be the highest.

Hence, the order of increasing boiling points follows:

$\text{LiBr }$

8 0

3 years ago

What's the equation for the reaction of Trifluoro bromide with Ammonia gas. ( brainliest assured )

sp2606 [1]

Answer:

Ammonium bromide can be prepared by the direct action of hydrogen bromide on ammonia. It can also be prepared by the reaction of ammonia with iron(II) bromide or iron(III) bromide, which may be obtained by passing aqueous bromine solution over iron filings.

Explanation:

please mark me as brainliest thank you

5 0

3 years ago

You have 2.394 x 102 mL of oxygen gas (O2) at 7.20 x 102 mm of Hg and 78 oC.

igomit [66]

We are given with
V = 2.394 x 102 mL
P = 7.20 x 102 mm of Hg
T = 78 oC

We are asked to determine the mass of the sample in milligrams
Using the ideal gas law
n = PV / RT
n = 7.20 x 102 mm of Hg (2.394 x 102 mL) / R (78 + 273)
Use the appropriate value for R or just convert the values to SI and use R = 8.314
Then, solve for the mass of the sample by using the MW Oxygen which is 16 g/mol

3 0

3 years ago

Is the dissolving of copper (ii) chloride in water a chemical change or a physical change why?

bija089 [108]

It would be a chemical change because the chloride water would have an effect on the copper. A way to tell if something is a chemical or physical change is that chemical change is not reversible. Physical change can be reversed. For example, water can be physically changed into ice, and it can go back into water. Hope this helps!

4 0

3 years ago

If the unknown elements on the periodic table are "unknown" how did they end up in the periodic table in the first place? *think

mezya [45]

Answer:

The periodic table is a marvel of organization, with each column and each row showing all ... Scientists identified the rest of them in the first half of the 20th century. ... They created in their lab a synthetic, previously unknown element. ... The Berkeley scientists did this for weeks on end, and produced a tiny amount of curium.

Explanation:

8 0

4 years ago