Chemistry, 07.09.2020 02:01 dareaalcaam111

Please help with question 3!! The question before it plays into question 3. The mass of the block was 337.50g and the volume was 75cm^3 (Density=Mass/Volume) which gave me a density of 4.5g/mL (Titanium). I’ll give the brainliest to whoever answers it!

Please help with question 3!! The question before it plays into question 3. The mass of the block w

Answers: 2

Show answers

Answers

Answer from: Quest

Answerthe same as;

Answer from: Quest

Atp, shorthand for adenosine triphosphate, is the standard molecule for cellular enger in the human body. all motion and metabolic processes within the body begins with energy that is released from atp, as its phosphate bonds are broken in cells through a process called hydrolysis.

Answer from: Quest

the missing options are :

(1) lower boiling point and a lower freezing point(2) lower boiling point and a higher freezing point(3) higher boiling point and a lower freezing point(4) higher boiling point and a higher freezing point

answer : the correct answer is option (3) higher boiling point and a lower freezing point

explanation :

when a non volatile solute is added to a solvent like water, it results in elevation of boiling point.

let us find the increase in boiling point of water when cacl₂ is added to water to make a solution of 1 m

step 1 : find molality of the solution

let us assume we have 1 l of solution.

$m = \frac{moles (solute)}{l ( solution)}$

$1 m = \frac{moles (cacl_{2})}{1 l }= 1 mol cacl_{2}$

let us convert this to grams of cacl₂.

molar mass of cacl2 is 111 g/mol

grams of cacl₂ = $1 mol \times \frac{111g}{mol} = 111 g cacl_{2}$

mass of solute = 111 g

assuming density of solution same as water which is 1g/ml we have ,

mass of solution = density * volume

mass of solution = $\frac{1g}{ml} \times 1000 ml = 1000 g$

mass of solution = mass of solvent + mass of solute

mass of solute = 1000g - 111g

mass of solute 889 g = 0.889 kg

the molality of the solution can be calculated as

$molality = \frac{mol (solute)}{kg ( solvent)}$

$molality = \frac{1mol}{0.889kg}$

molality = 1.12 m

step 2 : find boiling point elevation.

the elevation in boiling point is calculated as

$\bigtriangleup t_{b} = i \times k_{b} \times m$

here δtb = boiling point elevation

i = vant hoff factor which is the number of ions formed by the solute .

cacl₂ dissociates as $cacl_{2} \rightarrow ca^{2+} + 2 cl^{-}$

it forms 3 ions . therefore,

i = 3

m = molality which is 1.12 m

kb is constant for a given solvent. for water it is 0.512

$\bigtriangleup t_{b} = 3 \times 0.512 \times 1.12$

$\bigtriangleup t_{b} = 1.7$

the boiling point of water increases by 1.7 °c

step 3: find freezing point depression.

when a non volatile solute is added to water, it results in decrease in freezing point.

the formula to find freezing point depression is

$\bigtriangleup t_{f} = i \times k_{f} \times m$

kf is constant for water and its value is 1.86

$\bigtriangleup t_{f} = 3 \times 1.86 \times 1.12$

$\bigtriangleup t_{f} = 6.2$

the freezing point of water decreases by 6.2 °c

therefore we can say that, the solution will have a higher boiling point and a lower freezing point

Answer from: Quest

The most likely ph of a highly corrosive acid would be 1. because one is the most acie on the ph scale. the lower the number, the higher the acidity.

Another question on Chemistry

Chemistry, 22.06.2019 05:30

Arecipe calls for 1.2 cups of oil. how many liters of oil is this?

Answers: 2

Answer

Chemistry, 22.06.2019 17:10

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth

Answers: 2

Answer

Chemistry, 22.06.2019 20:20

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa

Answers: 2

Answer

Chemistry, 22.06.2019 21:00

Write a balanced equation showing the formation of copper (ii) nitrite from its elements

Answers: 1

Answer

You know the right answer?

Please help with question 3!! The question before it plays into question 3. The mass of the block wa...