CBSE > Class 11 > Chemistry | CBSE Board | Homework Help

The formula mass (formula weight) of a molecule is the sum of the atomic weights of the atoms in its empirical formula.
The molecular mass (molecular weight) of a molecule is its average mass as calculated by adding together the atomic weights of the atoms in the molecular formula.

2Thank You

ANSWER

Why it take more time to cook rice or dhal as compare to the plane area

Posted by Zone Technics 5 years, 7 months ago

CBSE > Class 11 > Chemistry

1 answers

Gaurav Seth 5 years, 7 months ago

On mountains and hilly regions, the air is less dense and the atmospheric pressure is also less. As the altitude is higher, the air column weight is reduced. So the pressure is reduced as compared to the sea level or below the mountains. Water has a lower boiling point at a lower temperature.

The food items like rice or meat need to be cooked at high temperatures. If we heat rice at 70°C, it does not cook completely. It becomes half cooked. Usually we use water to cook our food. So water heats up to the lower boiling point (say 80°C) at the top of the hill and boils. The temperature does not rise above 80°C. But at the sea level, the water boils up to 100°C and so the food is heated to 100°C. Then it is cooked nicely and it becomes soft and edible.

It is possible to add salt to water to increase the boiling point on top of hills. But salt water could change the taste of food.

1Thank You

ANSWER

Yar chemistry itni hard ku hai

Posted by Annu Yadav 5 years, 7 months ago

CBSE > Class 11 > Chemistry

5 answers

Kavya Singh 5 years, 7 months ago

Aur bio

2Thank You

Annu Yadav 5 years, 7 months ago

I don't like chemistry

2Thank You

Kavya Singh 5 years, 7 months ago

Ha 10th ka chemistry to pdhne bda mazza aaya tha

2Thank You

Shreya .. 5 years, 7 months ago

Hard h thodi pr padhoge toh kuch hard ni hota ˙˚ʚ(´◡`)ɞ˚˙

3Thank You

Kavya Singh 5 years, 7 months ago

Hard h toh ky kr skte h

1Thank You

ANSWER

What is ng (1.21) What is ns(1.22)

Posted by Manjeet Singh 5 years, 7 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Uses of chemistry...

Posted by Pk . 5 years, 7 months ago

CBSE > Class 11 > Chemistry

1 answers

Royal Thakur 5 years, 7 months ago

Koi baat nhi bro....... Its ok pk name bhi accha h....

2Thank You

ANSWER

Reference book for class 11 science.....

Posted by Royal Thakur 5 years, 7 months ago

CBSE > Class 11 > Chemistry

2 answers

Royal Thakur 5 years, 7 months ago

Thanks bro....

2Thank You

Pk . 5 years, 7 months ago

Hc verma according to me?

1Thank You

ANSWER

what is atomic spectra

Posted by Ajay Thakur 5 years, 7 months ago

CBSE > Class 11 > Chemistry

2 answers

Pk . 5 years, 7 months ago

The spectrum of frequency of electromagnetic radiation emitted or absorbed during transition of electron between energy levels within an atom each element is a characteristic spectrum by which it can be recognised.

2Thank You

Gaurav Seth 5 years, 7 months ago

Atomic spectra is the study of atoms (and atomic ions) through their interaction with electromagnetic radiation. We all know about the refraction of light. When light travels from one medium to another, it either bends towards the normal or away from the normal. The phenomenon of refraction is mainly attributed to the difference in the speed of light in various mediums. The speed of light depends upon the nature of the medium through which it passes.

1Thank You

ANSWER

Hey any on jst sujjest me any channel's name for chemistry ...?

Posted by Saurav Singh Surya 5 years, 7 months ago

CBSE > Class 11 > Chemistry

1 answers

Pk . 5 years, 7 months ago

Physicwallah

3Thank You

ANSWER

Name the phenomenon explained by wave nature of radiation.

Posted by Sumedha Sharma 5 years, 7 months ago

CBSE > Class 11 > Chemistry

1 answers

Pk . 5 years, 7 months ago

Most commonly observed phenomena with light can be explained by waves. But the photoelectric effect suggested a particle nature for light.

1Thank You

ANSWER

i) The elemental composition of butyric acid was found to be 54.2%C, 9.2%H and 36.6%O. Determine its empirical formula. ii) The molecular mass of butyric acid was determined by an experiment to be 88u . What is its molecular formula?

Posted by Priyanshi Upreti 5 years, 7 months ago

CBSE > Class 11 > Chemistry

1 answers

Lucky ✌️ 5 years, 7 months ago

i) C2H4O ii) C4H8O2

0Thank You

ANSWER

An organic compound containing carbon, hydrogen and oxygen gave the following percentage composition : C=40.68%, H=5.08% The vapour density of the compound is 59 . Calculate the molecular formula of the compound.

Posted by Priyanshi Upreti 5 years, 7 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

if 10 ml of oxalic acid with 1/20 molarity is showing pink color on adding 19 ml of naoh find molarity of water?

Posted by Palak Sindwani 5 years, 7 months ago

CBSE > Class 11 > Chemistry

3 answers

Palak Sindwani 5 years, 7 months ago

i am in 11th, i need the answer

0Thank You

Palak Sindwani 5 years, 7 months ago

what??

0Thank You

Shashwat Shukla 5 years, 7 months ago

Hii.r u in 12th now??

1Thank You

ANSWER

Calculate the molality of 98% H2SO4 aq solution by mass.

Posted by Supriyo Manna 5 years, 7 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 5 years, 7 months ago

Molarity ( mole/L)- Assume an identical solution with volume 1L. Now, the total mass of this solution as per the data =1.84 ×1000= 1840 g. The amount of (mass) H₂SO₄ =1840 ×0.98=1803.2 g. Number of moles= 1803.2/98= 18.4 moles. Theerfore, Molarity =18.4 M
Molality (mole(solute)/kg(solvent))- Assume an identical solution wherein there is 1000g of solvent. Thus here we will have the mass of H₂SO₄= 49000g (since, in this solution solute (H₂SO₄)is 98% and solvent thus is 2%). So, number of moles of H₂SO₄= 49000/98= 500. So , Molality = 500 mole/kg.