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3 years ago

What happens to the freezing point of a solution when more solute is added?

1 answer:

5 0

Freezing point depression is the phenomena that describes why adding a solute to a solvent results in the lowering of the freezing point of the solvent. ... Adding solute to a solvent will essentially dilute the solvent molecules, and according to Raoult's law, this leads to a decrease in vapor pressure.

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How many moles of potassium bromide are made if you start with 10.89 moles of aluminum bromide?

Lorico [155]

Answer:

I think 10

Explanation:

6 0

3 years ago

What is the composition, in atom percent, of an alloy that consists of 30 wt% Zn and 70 wt% Cu?

Xelga [282]

The composition, in atom percent, of an alloy that consists of 30 wt% Zn and 70 wt% Cu is 29.4 at % and 70.6 at % for Zn and Cu respectively.

<h3>How to convert weight % to atom %?</h3>

The weight percentage of an element can be converted to atom percentage as follows:

C(Zn) = C1A2 / (C2A1) + (C1A2) × 100
C(Cu) = C2A1 / (C1A2) + (C2A1) × 100

Where;

C1 = 30
C2 = 70
A1 = 65.4g/mol
A2 = 63.55g/mol

C(Zn) = {30*63.55} / (70*65.4) + (30*63.55) × 100
C(Cu) = {70*65.4} / (30*63.55) + (70*65.4) × 100

C(Zn) = 29.4 at %
C(Cu) = 70.6 at %

Therefore, the composition, in atom percent, of an alloy that consists of 30 wt% Zn and 70 wt% Cu is 29.4 at % and 70.6 at % for Zn and Cu respectively.

Learn more about atomic percent at: brainly.com/question/10018123

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8 0

2 years ago

The octet rule pertains to:

Vinil7 [7]

I think the answer to c

4 0

3 years ago

In the Northern Hemisphere, recall that atmospheric CO2 levels are highest in early spring and lowest during early fall. What ac

asambeis [7]

Answer:

Photosynthesis

Explanation:

Photosynthesis can be defined as the process whereby plants, some protistans, and some bacteria utilize the energy from sunlight to produce glucose from water and carbon dioxide. In early spring, there is the shift of plants from scanty winter branches to abundant spring leaves. When the leaves on the trees reduced in the fall, dead plants break down throughout the winter due to the activities of microbes. The microbes decompose the plant materials and generate carbon dioxide. This leads to increase in the level of carbon dioxide in the atmosphere. In the spring, leaves return to the plants/trees and the rate of photosynthesis increases greatly. This consumes more carbon dioxide and the level of carbon dioxide in the atmosphere reduced.

4 0

3 years ago

A liquid in lab has a density of 1.24g/cm3. What is the mass in grams of 254mL of the liquid?

o-na [289]

Answer:

Mass= 314.96 grams

Explanation:

The density of the substance is defined as mass per unit volume of it.

The formula is :

$density=\frac{mass}{Volume}$

Unit conversion:

1 liter = 1000 ml

$1dm^{3}=1Liter$

$1dm^{3}=1000ml$ ....(1)

$1dm^{3} = (10cm)^{3}$

$1dm^{3}=1000cm^{3}$

Replace The dm3 by cm3 in (1)

$1000cm^{3}=1000mL$

$1cm^{3}=1mL$

Volume = 254 mL = 254 cm3

Calculation of mass

$density=\frac{mass}{Volume}$

$1.24=\frac{mass}{254cm^{3}}$

$mass=1.24\times 254$

Mass= 314.96 grams(or 315 grams)

Note: Always makes same units before solving the question. You can not determine the mass if Volume is in mL and Density is in g/cm3. Change mL into cm3 first

8 0

3 years ago