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what is the diff between atoms and molecule?

_{3}_{ srisaji@yahoo.com}50 names of compounds and their chemical formula

Define mole concept?

what are the limitations of dalton's atomic theory?

The formula of compounds formed by following ions.

Cr

^{3+}and SO_{4 2-}^{}Pb

^{2+}and NO_{31-}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 * 10^{23 }mol^{ -1]}What is the difference between O2 and 2O?

Calculate the number of molecules of sulphur (S

_{8}) 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

how to calculate the valency of any compound?

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

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

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

How many atoms are there in 16 gram of oxygen?

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

_{2}CO_{3}.10H_{2}O).valency table

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

give me a list of atomicity of all elements

what is the number of molecules in 0.25 moles of oxygen gas?

prove the formula K.E.=1/2mv

^{2}a)CuSO

_{4}+waterb)alum + water

c)sugar + water

d)starch + water

From 200 mg of CO

_{2},10^{21}molecules are removed.How many moles of CO_{2}are left ?a) 0.288 b) 2.88 c) 0.00288 d) 0.0288

calculate the molar mass of CO2, H2SO4, NaCl?

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

what is meant by tetra atomic and poly atomic?I want all elements' symbols with their valencies and atomicity.

(b) Why does an atom of Argon have zero valency? Explain using the electronic configuration of Argon.

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

what is the atomicity of nitric acid

what are polyatomic ions?give examples

what is the valency of nitrite?

what is the difference between nitrate,nitride,nitrite?

Why is the valency of Phosphate three? explain.

what were the drawbacks of Daltons atomic theory?

_{8}) present in 128 g of solid sulphur.plzzzzzzzzanswer fast.........

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)1.032x10

^{22 }b)1.032 x 10

^{23}c)3.88 x 10

^{22}d)1.302 x 10

^{22}and pls explain

What is the atomicity of Carbon (C)?

_{4 -3)}if one mole of carbon atoms weighs 12g what is the mass of 1 atom of carbon?? plss explain....

why atomic mass of some element are in fraction

what is the atomicity of phosphorous?and valency?

1) calculate the number of molecules in 50g of calcium carbonate

2) calculate the number of moles for the following.

a.64g of oxygen atom

b.24*10 powered by 23 number of oxygen atom

3)calculate the formula unitmass of

a) calcium chloride b) sodium sulphite c) ammonium carbonate

4) calculate the no. of moles sulphur (Sg) present in 16g of solid sulphur

5) write the chemical formula using criss cross method

a)ammonium sulphate b)sodium sulphate c) barium nitrate

explain dalton's atomic theory and write its drawbacks

Is there any trick to learn Valency?

How to solve numericals based on the mole concept?

How many atoms of each element are present in 6.3g of nitric acid (HNO

_{3}) ?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 ?

A rectangular tank is filled with to 1/5 of its height . water from a tap flows into the tank at 1.8 litres a minute. how much water is in the tank after 6 minutes ? give your answer in litres.

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

Q1.An element X forms an Oxide with formula "X

_{2}O_{3}"_{}:-(a)State the valency of "X".

(b)Write the formula of chloride of "X".

(c)Sulphate of "X".

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

calculate the number of moles in 22g of carbondioxide?

what mass of oxygen will contain same number of molecules as 2.5moles ofchlorine,Cl2 ?

Calculate mass of 3.011 X 10

^{23}no of nitrogen atoms ( atomic mass of N = 14 u)give 2 examples of polyatomic elements

^{207}X_{82}difference between molecular mass formula unit mass.

(Atomic mass of Mg=24, S=32) ....PLS ANSWER FAST!!!!!

DEFINE MOLE CONCEPT & ITS FORMULAS?

/

an element Z has a valency of 3.what is the formula of oxide of Zz?

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

Calculate the number of molecules of phosphorous (p

_{4}) present in 248g of solid phosphorous. ( given atomic mass of phosphorous=31.0u No=6.022x10^{23}per mole )Convert into mole.

(a) 12 g of oxygen gas

(b) 20 g of water

(c) 22 g of carbon dioxide

name two elemental form of carbon?

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.

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

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 * 10

^{21}atoms b) 6.023 * 10^{23}atoms c) 1.7 * 10^{20}atoms d) 2.8 * 10^{2}^{2}atoms_{2}GASWhat is the difference between 2N and N

_{2}?Explain the formation of Al3+ ion and why is it formed?

what are alkalis give 2 examples

what is the differences between 2H and H

_{2}?8.What is the valency of a sulphide ion?1 g of silicon contains ' n' atoms. how many atoms are there in 0.8 g of calcium?Calculate the mass of one atom of sodium.

calculate the formula unit mass of na2so3.