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what is the diff between atoms and molecule?

a,18g of water h2o.

b.18g of oxygen o2.

c. 18g of carbon dioxide CO2.

d.18g of mithane CH4

50 names of compounds and their chemical formula

how many moles are present in 9g of water

Define mole concept?

What is the difference between O2 and 2O?

what are the limitations of dalton's atomic theory?

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

Mn=55.0u, O=16.0u.

gve list of monovalent cations/anions

diavalent cations /anions

trivalent cations/anions.

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

calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,N_{A}=6.022 * 10^{23 }mol^{ -1]}i) 46 grams of Na atoms (NUMBER FROM MASS)

ii) 8 grams of O

_{2}molecules (NUMBER OF MOLECULE FROM MASS)iii) 0.1 mole of carbon atoms (NUMBER OF GIVEN MOLES)

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

Please explain this statement .

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

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.

how to calculate the valency of any compound?

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

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

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

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

i) Fe3+ and So4 2- ii) NH4 +1 and CO3 2-

I want only this answer to be solved no other links which shows different:))

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

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

give me a list of atomicity of all elements

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

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

The formula of compounds formed by following ions.

Cr

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

^{2+}and NO_{31-}prove the formula K.E.=1/2mv

^{2}convert into mole...22 g carbon dioxide and 20 g of water.

calculate the molar mass of CO2, H2SO4, NaCl?

1 g of silicon contains ' n' atoms. how many atoms are there in 0.8 g of calcium?what is meant by tetra atomic and poly atomic?Which of the following does not affect the rate of evaporation ?

(1) Wind speed

(2) Surface area

(3) Temperature

(4) Insoluble heavy impurities

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

0.4 mole of CO

_{2}(At Mass of C = 12 &O=16 a.m.u) (17.6g)Calculate the number of moles in 52 g of helium gas ?

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

_{2}?what are polyatomic ions?give examples

calculate the mass of 0.5 mole of sugar (c12h22o11)

what is the difference between nitrate,nitride,nitrite?

what were the drawbacks of Daltons atomic theory?

a...Dalton's atomic theory

b...law of constant proportions

c...law of multiple proportions

d...law of conservation of mass

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

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

_{2}{atomic mass of calcium is 40u and chlorine is 35.5u }what is the atomicity of phosphorous?and valency?

explain dalton's atomic theory and write its drawbacks

Is there any trick to learn Valency?

State the nature of the constituent of canal rays?

How to solve numericals based on the mole concept?

What do the following abbreviations stand for

O

2O

O

_{2}3O

_{2}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?

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

Calculate mass of 3.011 X 10

^{23}no of nitrogen atoms ( atomic mass of N = 14 u)Q. How many molecules are present in 1 ml of water..? explain

Calculate the mass of 6.022 x 10

^{23}number of N_{2}molecules.give 2 examples of polyatomic elements

difference between molecular mass formula unit mass.

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

DEFINE MOLE CONCEPT & ITS FORMULAS?

/

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

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

Ca

^{2+}, K^{+}, Fe^{3+}, Cl^{-}, SO_{4}^{2-}Convert into mole.

(a) 12 g of oxygen gas

(b) 20 g of water

(c) 22 g of carbon dioxide

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 )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

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.

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}atomsa) Molecules having one kind of atoms only.

b) Molecules having two different kinds of atoms.

c) Molecules having three different kinds of toms.

What is the difference between 2N and N

_{2}?_{3}_{ srisaji@yahoo.com}what are alkalis give 2 examples

what is the differences between 2H and H

_{2}?Calculate the mass of one atom of sodium.