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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

Define mole concept?

how many moles are present in 9g of water

what are the limitations of dalton's atomic theory?

gve list of monovalent cations/anions

diavalent cations /anions

trivalent cations/anions.

_{2}CO_{3}.10H_{2}O).calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,N_{A}=6.022 * 10^{23 }mol^{ -1]}0.4 mole of CO

_{2}(At Mass of C = 12 &O=16 a.m.u) (17.6g)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

The formula of compounds formed by following ions.

Cr

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

^{2+}and NO_{31-}how can we find the valency of polyatomic ions like SO4, SO3, CO3,PO4 etc.?

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

(1) Wind speed

(2) Surface area

(3) Temperature

(4) Insoluble heavy impurities

how to calculate the valency of any compound?

What is the difference between O2 and 2O?

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

on analysis , it was found that the black oxide of copper , red oxide of copper , litherage, the red oxide of lead and peroxide of lead contain 79.90%, 88.8%, 92.88%, 90.6% and 86.6% respectively of the metal. establish the law of multiple proprotions with the help of data

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

HOW MANY MOLES ARE THERE IN 5G OF SODIUM HYDROXIDE

rnvalency table

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

calculate the number of molecules in 1ml of O

_{2}at STPgive me a list of atomicity of all elements

Which of the following samples contains 2.0 * 10

^{23}atoms ?a) 8.0 g O

_{2}b) 3.0 g Be c) 8.0 g C d) 19.0 g F_{2}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

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

^{2}Convert 10g of oxygen gas into no. of moles.

calculate the molar mass of CO2, H2SO4, NaCl?

what is meant by tetra atomic and poly atomic?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.

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 ?

Q. Two bodies A and B are charged with equal magnitude of charge but A with positive charge and B with negative. If M

_{A}and M_{B}are masses before charging and M_{A}and M_{B}are the masses after charging, then (mo is some constant mass ).(a) M

_{A}= M_{A}+ M_{o}and M_{B}= M_{B}– m_{o}(b) M_{A}= M_{A}– M_{o}and M_{B}= M_{B}+ m_{o}(c) M

_{A}= M_{A}(d) M_{A}= M_{A}– and M_{B}= M_{B}+ m_{o}what are polyatomic ions?give examples

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 the difference between nitrate,nitride,nitrite?

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

what were the drawbacks of Daltons atomic theory?

Calculate the mass of (a) 0.1 mole of KNO3 (b) 1 x 10 23 (c) 112 cm3 molecule of methane of hydrogen at STP

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....

_{3}) when heated produced 1.92 of oxygen and the residue (KCL) left behind weighed 2.96g.Show that these results illustrate the Law of Conservation of Mass.pls give d ans. fastwhy atomic mass of some element are in fraction

what is the atomicity of phosphorous?and valency?

calculate the percentage of iron in potassium ferro cyanide K

_{4 }(Fe(CN)_{6})[Fe=56, S=32, O=16, H=1, K=39, C=12, N=14]

explain dalton's atomic theory and write its drawbacks

is calcium carbonate a molecular or ionic compound

Is there any trick to learn Valency?

2g of hydrogen combine with 16g of oxygen to form water.How many grams of water will be formed?Please help me solve this problem as soon as possible!

How to solve numericals based on the mole concept?

how many atoms are present in H2So4?

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

I) 32g of oxygen gas

2) 80g of water

3)44g of carbon dioxide.

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?

calculate the number of moles in 22g of carbondioxide?

Calculate mass of 3.011 X 10

^{23}no of nitrogen atoms ( atomic mass of N = 14 u)^{207}X_{82}Q. How many molecules are present in 1 ml of water..? explain

mass and its valency

Please give me answer of this question

Please give me answer fast

I don't understand this question

Please expert answer me

#Thankyou

give 2 examples of polyatomic elements

calculate the number of moles in 32g of methane.

difference between molecular mass formula unit mass.

If the atomic weight of carbon were set at 24 amu, what would have been the value of Avogadro's constant?

DEFINE MOLE CONCEPT & ITS FORMULAS?

/

An atom is the smallest particle of an element that exhibits all the properties of that element.Give reason.

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

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.

For hydrogen peroxide H2O2,

why he 2's are not cancelled.

Why it is not just HO?

What is special about it?

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

An element E forms the following compounds with hydrogen and oxygen,

a) H

_{2}E b) EO_{2 }c) EO_{3}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}atomsQ2 calculate the no. Of moles present in 0.25 moles of water.

Q3 which has more no. Of atoms – 100gms of silver or 100gms of iron? (fe=56,ag=108)

Q4 how many atoms will be present in 0.05 moles of ozone? (O=16)

What is the difference between 2N and N

_{2}?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)

_{3}_{ srisaji@yahoo.com}Calculate the number of the constituent atoms in 53 grams of Na2CO3( At. massses of Na= 23u , C=12u, O =16u)

I did the questions something like this-

We know that,

n = mass/ molar mass and n= no. of particles/ 6.022 * 10 to the power 23

where n is the no. of moles

Now, from above two equations, we can say that, mass/molar mass=no. of particles/6.022 * 10 to the power 23

so, 53/106 = no. of particles/6.022 * 10 to the power 23and so, no. of particles = 53/106* 6.022 * 10 to the power 23or, no. of particles = 3.011 * 10 to the power 23Experts please tell me whether I am right or wrong. I f I am wrong, then in which step I have done wrong.Plzzzzz..... reply fast.Thank youwhat are alkalis give 2 examples

what is the differences between 2H and H

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