what is the diff between atoms and molecule?

Calculate the molecular mass of potassium permanganate (KMnO4). Atomic masses: K=39.0u,

Mn=55.0u, O=16.0u.

50 names of compounds and their chemical formula

The formula of compounds formed by following ions.

Cr³⁺ and SO_{4 ^2-}

Pb²⁺ and NO_3^1-

Define mole concept?

what are the limitations of dalton's atomic theory?

what is the valency of nitrite?

gve list of monovalent cations/anions

diavalent cations /anions

trivalent cations/anions.

calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,N_A =6.022 * 10²³ mol ^-1]

how many moles are present in 9g of water

Calculate the number of molecules of sulphur (S₈) present in 16 g of solid sulphur.

In this question why do we multiply the avagadro number? We are to find number of molecules, so why we take out moles?????????????? plzzzzzz reply

Convert 10g of oxygen gas into no. of moles.

how can we find the valency of polyatomic ions like SO4, SO3, CO3,PO4 etc.?

What is the difference between O2 and 2O?

how to calculate the valency of any compound?

 calculate the molar mass of nitric acid HNO3 (H=1,N=14,O=16)

  Calculate the mass of 1 atom of silver and 1 molecule of carbon dioxide.

valency table

calculate the no. of aluminium ions present in 0.051g of aluminium oxide

give me a list of atomicity of all elements

From 200 mg of CO₂ ,10²¹ molecules are removed.How many moles of CO₂ are left ?

a) 0.288 b) 2.88 c) 0.00288 d) 0.0288

calculate the molar mass of CO2, H2SO4, NaCl?

prove the formula K.E.=1/2mv²

what is meant by tetra atomic and poly atomic?

I want all elements' symbols with their valencies and atomicity.

the reciprocal of ____________ is called avogram

Calculate the number of moles in 52 g of helium gas ?

what are polyatomic ions?give examples

 what is the difference between nitrate,nitride,nitrite?

 what were the drawbacks of Daltons atomic theory?

in HNO3 the valency of hydrogen is 1 and valency of NO3 is 2 then why it is written HNO3 in place of H2NO3

 if the isotopic distribution of C-12 and C-14 is 98% and 2% respectively, the number  of C-14 atoms in 12 g of carbon is

a)1.032x10²² 

b)1.032 x 10²³

c)3.88 x 10²²

d)1.302 x 10²²

and pls explain

How will you prove experimentally the law of conservation of mass?

HOW MANY MOLES ARE THERE IN 5G OF SODIUM HYDROXIDE

if one mole of carbon atoms weighs 12g what is the mass of 1 atom of carbon?? plss explain....

Calculate the number of molecules of phosphorus [P4] present in 31 gram of phosphorus.

why atomic mass of some element  are in fraction

is calcium carbonate a molecular or ionic compound

what is the atomicity of phosphorous?and valency?

explain dalton's atomic theory and write its drawbacks

does molecule take part in a chemical reaction

Is there any trick to learn Valency?

How to solve numericals based on the mole concept?

If hydrogen combines with oxygen in ratio of 1:8 by mass to form H₂O. How many moles of oxygen would be reqired for the given amount of hydrogen gas. [ At. mass of H=1u, O=16u]

A ball is dropped from a height of 10m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back ?

what are the first 20 elements in the periodic table in order along with thier atomic and mass number?

Why is valency of magnesium 2? How can we find the valency of an atom?

• Find the number of Protons and Neutrons in the nucleus of an atom of an element x which is represented as²⁰⁷X₈₂

calculate the number of moles in 22g of carbondioxide?

Give some examples of octa atomic ion/

Calculate mass of 3.011 X 10 ²³no of nitrogen atoms ( atomic mass of N = 14 u)

WHEN COPPER CARBONATE REACTS WITH HYDROCHLORIC ACID, ACCORDING TO ME THE PRODUCTS WILL BE COPPER CHLORIDE AND HYDROGEN CARBONATE.

CUCO3+HCL=CUCL+HCO3

BUT IT THE TEXTBOOKK ITS WRITTEN THAT THE PRODUCTS OF THIS REACTION IS COPPER CHLORIDE, CARBON DIOXIDE AND WATER. HOW IS THIS POSSIBLE

Q. How many molecules are present in 1 ml of water..? explain

give 2 examples of polyatomic elements

difference between molecular mass formula unit mass.

carbon and oxygen combine to form carbon dioxide gas.they do so in the same ratio 3:8 .what mass of oxygen would be required to react completely with 6.0g of carbon? also calculate the mass of carbon dioxide gas so formed. which law of chemical combination will govern our answer?

DEFINE MOLE CONCEPT & ITS FORMULAS?

/

1. Using Avogadro's number to convert from molecules or atoms to moles. 
   1. 2.57 x 10¹¹ atoms of silver equals how many moles of silver? [What is the chemical symbol of silver?]
   2. 0.0524 moles of H₂O equals how many molecules of water?
   3. 3.25 x 10²⁵ atoms of neon gas equals how many moles of neon gas?

Is there any difference between molar mass and molecular mass?If yes then how

1. the molecular formula of sulphuric acid is H2SO4: (a) calculate the molecular mass of sulphuric acid. (b) how many moles are there in 9.8g of sulphuric acid ? (c) how many "gram-atoms" of each element are there in 9.8g of sulphuric acid ? (atomic masses: H = 1, S = 32, O = 16) 2. Find the number of molecules present in a drop of chloroform (CHCl3) weighing 0.0239g. (C = 12, Cl = 35.5, H = 1)

Convert into mole.

(a) 12 g of oxygen gas

(b) 20 g of water

(c) 22 g of carbon dioxide

1. H2O
2. CO2
3. H2
4. NH3
5. CH4
6. C2H6
7. C2H4
8. CH3OH

Relative density of gold is 19.5.The density of water is 1000kg/m3.what will be the density of gold in S.I unit and in g/cc.

What do you mean by atomicity of the molecule of an element?

GIVE AN EXAMPLE OF 1] DIATOMIC 2] TRIATOMIC MOLECULE OF COMPOUNDS

Chlorophyll contains 2.68% of magnesium by mass.Calculate the number of magnesium atoms in 3.00 g of chlorophyll

a) 1.98 * 10²¹ atoms b) 6.023 * 10²³ atoms c) 1.7 * 10²⁰ atoms d) 2.8 * 10²² atoms

How many atoms are present in 0.012 kg of C-12 ? What is the name given to this statement ?

What is the difference between 2N and N₂ ?

• Which has more number of atoms? 100g of N2 or 100g of NH₃

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what are alkalis give 2 examples

what is neon?cation or anion

what is the differences between 2H and H₂ ?

What do the following abbreviations stand for

O

2O

O₂

3O₂

Calculate the mass of one atom of sodium.