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Syeda
answered
1 year(s)
, 10 month(s) ago

If the density of methanol is 0.793 kg/L, what is its volume needed for making 2.5 L of its 0.25M solution?

in 1 litre, mole = 0.25

in 2.5 litre, mole = 0.625

mass of 1 mole CH3OH = 32g

mass of 0.625 mole = 20g

volume = mass/density = 20/0.793 = 25.2ml

- 4 Answers
- 2 Likes
- 34560 Views

Swathi
answered
3 year(s)
, 10 month(s) ago

50.0 kg of N2 (g) and 10.0 kg of H2 (g) are mixed to produce NH3 (g). Calulate the NH3 (g) formed. Identify the limiting reagent in the production of NH3 in this situation.

Let us write the balanced equation

N_{2} + 3H_{2} → 2NH_{3}

Now calculate the number of moles

Number of moles of N_{2} = 50 kg of N_{2 }= 50 X

- 1 Answer
- 5 Likes
- 32985 Views

Swathi
answered
3 year(s)
, 11 month(s) ago

A solution of glucose in water is labeled as 10% w/w, what would be the molality and molarity of the solution. Density of solution is 1.2 ml-1

10%w/w solution of glucose in water means 10 g of glucose present in 100g of solution.

Therefore, Mass of glucose is 10g

Mass of water is = 100g- 10g = 90 g = 0.09 kg

And density = 1.2gmL

Asked by Shivam balla

May 9

- 1 Answer
- 2 Likes
- 19186 Views

Syeda
answered
1 year(s)
, 10 month(s) ago

Number of electrons present in 1.4 grams of Nitrogen gas

Ans: Number of moles in the given weight of Nitrogen gas.

Number of moles = Given weight/molecular weight

= 1.4/28

=0.05 moles

1 mole of Nitrogen contains Avogadro number (6.023*...

- 5 Answers
- 4 Likes
- 19058 Views

Syeda
answered
1 year(s)
, 10 month(s) ago

Relation between molality, molarity and density

Answer.

Relationship between molarity, molality and density:

Density = Molarity/Molality

Given Molarity = 12.5 mol/vol(cc) and Molality = 11.5 mol/mass (grams)

Density = [12.5

- 2 Answers
- 0 Like
- 11312 Views

Jaimin
answered
3 year(s)
, 6 month(s) ago

50kg of nitrogen and 10kg of hydrogen are mixed to produce ammonia. Calculate the ammonia formed.

5666.6743

- 3 Answers
- 0 Like
- 10203 Views

Swathi
answered
4 year(s)
, 6 month(s) ago

limiting reagent

The reactant which is present in lesser amount is called limiting reagent

Limiting reagent limits the participation of other reactant which is in excess in the reaction.

Example:50 kg N
_{2 }...

- 1 Answer
- 2 Likes
- 8459 Views

Satyanarayana
answered
4 year(s)
, 11 month(s) ago

4 liters of water are added to 2 L of 6 molar HCl solutions. what is the molarity of resulting solution?

Ans: Initial Volume = 2 liters

Number of moles (n) = 6

Number of moles (n) = weight/gram molecular weight

Gram Molecular weight of HCl = 1+ 35.5 = 36.5 grams

Number of moles (n)...

- 1 Answer
- 0 Like
- 5209 Views

Swathi
answered
4 year(s)
, 5 month(s) ago

Number of molecules present in CO2

Molar mass of CO_{2} is 44g

44g of CO_{2} Contains 6.023X10^{23} molecules

200mg = 0.2 g

0.2 g of CO_{2} Contains --------?

= 0.2 X6.023

...- 1 Answer
- 0 Like
- 4683 Views

Swathi
answered
3 year(s)
ago

Calculate the uncertainty in the velocity of a wagon mass 3000 kg

Given data:

Mass of wagon (m) = 3000 kg

Position (Δx)= 10 pm = 10 ×10^{-12}m = 10^{-11}m

Planck's constant = 6.63 x10^{-34} Js

Βy uncertainty pr

- 1 Answer
- 1 Like
- 4621 Views

Satyanarayana
answered
4 year(s)
, 11 month(s) ago

calculate the mass percentage composition of copper pyrites ( CuFeS2 ).

Ans: Let the number of moles of given copper pyrite (CuFeS2) = 1

Every 1 mole of copper pyrite contains 2 moles of Sulphur and 1 mole of each of Copper and Iron.

Gram molecular weight of 1 mole...

- 1 Answer
- 1 Like
- 4417 Views

Swathi
answered
4 year(s)
, 9 month(s) ago

why the electronic configuration of actinides cannot be assigned with degree of certainity?

Due to the following reasons electronic configuration of actinides cannot be assigned with degree of certainity The difference in energy between the 5f and 6d orbitals is small for the first four elements, thor...

- 1 Answer
- 0 Like
- 4157 Views

Satyanarayana
answered
4 year(s)
, 6 month(s) ago

Calculation of molality

Ans: Given molarity of H2SO4 = 2.5

Density = 1.99 grm/ml

Mass solution = volume of solution*density

Let volume of solution = 100 ml

Then mass of solution = density* 100 ml

...- 1 Answer
- 0 Like
- 3909 Views

Satyanarayana
commented
4 year(s)
ago

Stoichiometry

**Ans:** CO
_{2} + C = 2CO

At STP any gas occupies 22.4 liters of volume.

Therefore 22.4 litres will produce 44.8 litres of CO (from the equation of the reaction)

...

- 1 Answer
- 1 Like
- 3827 Views

Akshita
answered
4 year(s)
ago

Calculate the molarity of solution of ethanol in water in which the mole fraction of ethanol is 0.040

let the moles of ethanol be n and of water be N

mole fraction = n/n+N=0.046

OR

=N/n+N=0.960

we get n/N =1/24 = mole

now using d m...

- 1 Answer
- 0 Like
- 3667 Views

Satyanarayana
answered
4 year(s)
, 5 month(s) ago

Colour and smell of the following salts : NaCl KBr NaBr KI CH3COONa KNO3 Na2SO4 K3PO4 Na2HPO4

Ans:

NaCl - White - Odourless

KBr - White - Odourless

NaBr - White - Odourless

KI - White - slight odour

CH_{3<}

Asked by Rajesh joshi

Oct 21

- 1 Answer
- 0 Like
- 3273 Views

Swathi
answered
4 year(s)
, 11 month(s) ago

Which of the following contains maximum number of oxygen atoms? a) 1.0 gm. O-atom b) 1.0 gm. O2 C) 1.0 gmO3

All contains equal number of atoms.

1 gram of oxygen atom 1 gram of oxygen molecule 1 gm of O
_{3} molecule contains 6.023*10
^{23} atoms

- 1 Answer
- 0 Like
- 3258 Views

Shamsher
commented
4 year(s)
ago

Zn and Hcl react Zn + 2Hcl -> ZnCl2 + H2. If 3 mole zinc is added to Hcl containing 0.52 mole of HCl. How many moles of H2 are produced?

the answer is 0.26 moles

as 2 HCL require 1 H2

and 0.52 moles of hcl gives 1/2*0.52 moles of h2

therefore we get d moles of h2 produce is 0.26

we have use the moles of hcl rather...

- 2 Answers
- 0 Like
- 3155 Views

Swathi
answered
4 year(s)
, 7 month(s) ago

Hydrogen sulphide (H 2 S) contains 94.11% sulphur, water (H 2 O) contains 11.11% hydrogen and sulphur dioxide (SO 2 ) contains 50% oxygen. ..

The weight of hydrogen in water = 11.11 g

The weight of oxygen in water = 100 -11.11 = 88.89 g

weight of sulphur in sulphur dioxide = 50g

weight of oxygen sulphur dioxide = 100 -50 = 5...

- 1 Answer
- 1 Like
- 2952 Views

Swathi
answered
4 year(s)
, 5 month(s) ago

Calculation of volume occupied by one atom from density and atomic mass of element

Density = mass \volume

Volume = mass/density

= 60 g/10 g/cm^{3 }= 6 cm^{3}

the volume occupied by 1 mole (6.023X10^{23} atoms) is 6 cm^{3}

- 1 Answer
- 0 Like
- 2936 Views

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