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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

the reciprocal of ____________ is called avogram

Define mole concept?

calculate the number of ions number of oxygen atoms, total charge in 3g of (co

_{3})^{2}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.

one atom of magnesium is 24 times heavier than 1/12 of a carbon -12 atom , so the atomic mass of magnesium is ?please give full description?

calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,N_{A}=6.022 * 10^{23 }mol^{ -1]}(A) To remove the volatile impurities

(B) Oxidation

(C) Reduction

(D) To make slag

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

a,18g of water h2o.

b.18g of oxygen o2.

c. 18g of carbon dioxide CO2.

d.18g of mithane CH4

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

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}how to calculate the valency of any compound?

one gram of a mixture of potassium and sodium chloride on treatment with excess of silver nitrate gave 2g of AgCl . what was the composition of the two salts in the original mixture.

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.

What is the difference between O2 and 2O?

valency table

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

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!

give me a list of atomicity of all elements

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

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

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

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

^{2}10 ml each of 0.1 M Bacl2 and K2SO4 are mixed. which will have the highest concentration in the solution?

calculate the molar mass of CO2, H2SO4, NaCl?

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

what is meant by tetra atomic and poly atomic?_{2}CO_{3}.10H_{2}O).I want all elements' symbols with their valencies and atomicity.

how many moles are present in 9g of water

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

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

what are polyatomic ions?give examples

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

what is the difference between nitrate,nitride,nitrite?

what were the drawbacks of Daltons atomic theory?

calculate the number of molecules in 1ml of O

_{2}at STPif 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

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]

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) aluminium cyanide

2) magnesium chlorate

3) ammonium sulphate

4) iron (II) oxide

5) potassium di chromate

6) hydrogen nitrate

explain dalton's atomic theory and write its drawbacks

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

Is there any trick to learn Valency?

Boron has two isotopes B10 and B11 whose relative abundances are 20% and 80% respecctivly. Atomic weight of Boron is :A) 10B)11C)10.5D)10.8please show the answer with method

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.

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

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) What is the colour of the compound formed ?

b) Write the effect of magnet on it .

c) Write the action of carbon disulphide on it .

d) Describe the effect of adding dilute hydrochloric acid to it . Identify the gas and write its two properties .

{ please answer this fast as it is very urgent }

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

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 youcalculate the number of moles in 22g of carbondioxide?

_{2}) under N.T.P conditions?Calculate mass of 3.011 X 10

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

1. If u melt 100 g of ice will u get the same mass of water?

2.Which of the following rection does not conform to the law of conversation of mass?

A]BURNING OF CANDLE

B]MELTING OF ICE

C]FUSION REACTION OCCURING IN SUN

D]COMBUSTION OF FUEL

3. In chemical rections how does law of conversation of mass contribute in writing cnemical equaions?

give 2 examples of polyatomic elements

difference between molecular mass formula unit mass.

is calcium carbonate a molecular or ionic compound

DEFINE MOLE CONCEPT & ITS FORMULAS?

/

what is the valency of nitrite?

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

a) 84g of nitrogen atoms

b)8.066 * 10

^{23}number of nitrogen atoms (given atomic mass of n = 14)Convert into mole.

(a) 12 g of oxygen gas

(b) 20 g of water

(c) 22 g of carbon dioxide

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.

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

What does the following denote 2N , N

_{2}, 2N_{2}, N.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 is the difference between 2N and N

_{2}?What is the ratio by mass of constituting element in following ionic compounds.

1) Magnesium Sulphide

2)Sodium Chloride

3)Ammonia

4)Calcium Oxide

5)Carbon dioxide

6)Water

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

What do the following abbreviations stand for

O

2O

O

_{2}3O

_{2}what is the differences between 2H and H

_{2}?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".

Calculate the mass of one atom of sodium.