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what is the diff between atoms and molecule?

how many moles are present in 9g of water

50 names of compounds and their chemical formula

a,18g of water h2o.

b.18g of oxygen o2.

c. 18g of carbon dioxide CO2.

d.18g of mithane CH4

Define mole concept?

How many times heavier is one atom of carbon than one atom of oxygen?

what are the limitations of dalton's atomic theory?

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

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

Mn=55.0u, O=16.0u.

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

Which of the following does not affect the rate of evaporation ?

(1) Wind speed

(2) Surface area

(3) Temperature

(4) Insoluble heavy impurities

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 NITROGEN WHICH CONTAINS SAME NUMBER OF MOLECULES AS ARE PRESENT IN 4.4GM OF CO

_{2}?Calculate the mass of 1 atom of silver and 1 molecule of carbon dioxide.

Which amongst the following has more no: of atoms? 11.5 g of sodium or 15 g of calcium?

Given Na = 23 u. Ca= 40u

valency table

How many atoms of oxygen are present in 50 g of calcium carbonate?

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

_{2}CO_{3}.10H_{2}O).give me a list of atomicity of all elements

1. how many individual atoms are there in each of the following ? (a) 32 moles of sulphur (b) 32g of sulphur (c) 32u of sulphur (S = 32) 2. how many moles are there in each of the following ? (a) 280g of silicon (b) 12.044 x 10^25 atoms of phosphorus (c) 19.0 atoms of fluorine 3. One mole of zinc atoms weigh 65g. calculate the weight of one atom of zinc.

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 mass of 6.022 x 10

^{23}number of N_{2}molecules.prove the formula K.E.=1/2mv

^{2}calculate the molar mass of CO2, H2SO4, NaCl?

The formula of compounds formed by following ions.

Cr

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

^{2+}and NO_{31-}what is meant by tetra atomic and poly atomic?Convert 10g of oxygen gas into no. of moles.

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

convert into mole...22 g carbon dioxide and 20 g of water.

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

how many moles of C02 are present in 51.2 g of it? (atomic mass of carbon = c is 12u and o is 16u)

what are polyatomic ions?give examples

what is the difference between nitrate,nitride,nitrite?

what were the drawbacks of Daltons atomic theory?

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 do the symbols H

_{2},S & O_{4}mean in the formula H_{2}SO_{4?}if one mole of carbon atoms weighs 12g what is the mass of 1 atom of carbon?? plss explain....

1) 10^21 atoms of U-238

2) 10^20 molecules of SO2 gas

I know the step to solve this I.e.

1) n=N/avagadro no.

m= nM = N/avgadro no. M

= (10^21 / 6.022 10^23) 238g

but I am not able to simplify this :( plzz help!! in the nxt part of the ques I am stucking when it comes to simplification...

2) ,....... (10^20 /6.02210^23) 64g

why atomic mass of some element are in fraction

CALCULATE THE RATIO OF MOLECULES PRESENT IN 6.6g OF CO

_{2 }AND 3.2G OF SO_{2}?(C=12U,O=16U,S=32U)what is the atomicity of phosphorous?and valency?

^{207}X_{82}explain dalton's atomic theory and write its drawbacks

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

Is there any trick to learn Valency?

0.4 mole of CO

_{2}(At Mass of C = 12 &O=16 a.m.u) (17.6g)How to solve numericals based on the mole concept?

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

Why are Dalton's symbols not used in Chemistry

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 ?

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 is the molar mass of Na

_{2}SO_{3}?Calculate mass of 3.011 X 10

^{23}no of nitrogen atoms ( atomic mass of N = 14 u)a) formation of isotopes

b) formation of isobar

c) law of multiple proportions

d) graphite and diamond though made from carbon , show different properties

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

give 2 examples of polyatomic elements

difference between molecular mass formula unit mass.

A pure sample of carbon dioxide gas was obtained by strongly heating calcium carbonate.What is the ratio by mass of element present in gas?

DEFINE MOLE CONCEPT & ITS FORMULAS?

/

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

What do the following abbreviations stand for

O

2O

O

_{2}3O

_{2}Convert into mole.

(a) 12 g of oxygen gas

(b) 20 g of water

(c) 22 g of carbon dioxide

1 g of silicon contains ' n' atoms. how many atoms are there in 0.8 g of calcium?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.

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

calculate number of molecules of oxygen in 6.4g of oxygen?

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}atomswhat happens in the reaction flask?

do you think that a chemical reaction has taken place?

why should we put a cork on the mouth of the flask?

does the mass of the flask and it s contents change?

What is the difference between 2N and N

_{2}?An element M forms the oxide M2O3. What will be the formula of its carbonate?

_{3}_{ srisaji@yahoo.com}1) Atoms combine in the ration of small whole numbers to form compounds.

2) The relative number and kinds of atoms are constant in a given compound.

Please explain these 2 laws of Dalton's theory.

what are alkalis give 2 examples

If 100g of calcium carbonate on heating produces 44g of carbon dioxide, how much quick lime will be formed?Which law follows from this example? Define the law.

what is the differences between 2H and H

_{2}?The mass of one molecule of a substance is 11.79 X 10

^{-26}kg. What is its molar mass? What could be the substance?Calculate the mass of one atom of sodium.