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what is the diff between atoms and molecule?

Which of the following has the maximum number of atoms?

50 names of compounds and their chemical formula

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

Define mole concept?

(C) KCl, Cl2O, K2O (D) H2S, SO2, H2O

what are the limitations of dalton's atomic theory?

(3) 2 (4) 22.4

gve list of monovalent cations/anions

diavalent cations /anions

trivalent cations/anions.

^{24}Mg_{12}and^{26}Mg_{12}are symbols of two isotopes of magnesium. Compare the atoms of these isotopes with respect to :(1) the composition of their nuclei.

(2) their electronic configurations.

(3) give the reason why the two isotopes of magnesium have different mass

numbers.

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 atomicity of nitric acid

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

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

Mn=55.0u, O=16.0u.

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

how many moles are present in 9g of water

how to calculate the valency of any compound?

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

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

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

a)CuSO

_{4}+waterb)alum + water

c)sugar + water

d)starch + water

valency table

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}atomscalculate the no. of aluminium ions present in 0.051g of aluminium oxide

How much Ca is present in the total amount of Ca(NO

_{3})_{2 }that contains 20 g of nitrogen?give me a list of atomicity of all elements

What is the difference between O2 and 2O?

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

^{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

calculate the molar mass of CO2, H2SO4, NaCl?

what do we call those particles which have more or less electrons than a normal atom?

what is meant by tetra atomic and poly atomic?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.

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

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

what are polyatomic ions?give examples

what is the difference between nitrate,nitride,nitrite?

what were the drawbacks of Daltons atomic theory?

which has he maximum volume of S.T.P and why?

(a) 1.5 * 10

^{23 }molecules of CO_{2}(b) 1g of H

_{2}(c) 4g of O

_{2}(d) 16 g SO

_{3}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....

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}why atomic mass of some element are in fraction

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

what is the atomicity of phosphorous?and valency?

calculate the mass of anhydrous HCL in 10 ml of concentrated HCL having density = 1.2 g/ml and 37% HCL by weight

explain dalton's atomic theory and write its drawbacks

GIVEN:

VAPOUR DENSITY

= MASS OF CERTAIN GAS (22.4L) AT STP/ MASS OF CERTAIN VOLUME OF H2 GAS (22.4L) AT STP

=Mw/2

=DENSITY OF GAS/DENSITY OF HYDROGEN

1.VAPOUR DENSITY OF A METAL CHLORIDE IS 66. ITS OXIDE CONTAINS 53% METAL. THE ATOMIC MASS OF THE METAL IS

(A) 21

(B)54

(C)27.06

(D)2.086

2.WHICH OF THE FOLLOWING TWO SUBSTANCES HAVE SAME VAPOUR DENSITY?

(A)GLUCOSE,FRUCTOSE

(B)FRUCTOSE, SUCROSE

(C)SUCROSE, GLUCOSE

(D) STARCH, GLUCOSE

Is there any trick to learn Valency?

Q. What percentage of oxygen is present in the compound CaCO

_{3}3Ca_{3}(PO_{4})_{2}?(A) 23.3% (B) 45.36% (C) 41.94 % (D) 17.08%

How to solve numericals based on the mole concept?

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 ?

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

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

calculate the number of moles in 22g of carbondioxide?

a,18g of water h2o.

b.18g of oxygen o2.

c. 18g of carbon dioxide CO2.

d.18g of mithane CH4

Calculate mass of 3.011 X 10

^{23}no of nitrogen atoms ( atomic mass of N = 14 u)calculate the number of molecules present in a drop of chloroform (CHCl3) weighing 0.0239g.

give 2 examples of polyatomic elements

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.

difference between molecular mass formula unit mass.

calculate the mass of 0.5 mole of sugar (c12h22o11)

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

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.

calculate the number of molecules in 1ml of O

_{2}at STPGIVE AN EXAMPLE OF 1] DIATOMIC 2] TRIATOMIC MOLECULE OF COMPOUNDS

What is the difference between 2N and N

_{2}?when 4.2gram of sodium hydrogen carbonate is added to a solution of hydrocloric acid weighing 10g . it is observed that 2.2gram of carbon dioxide is released into the atmosphere .The residue left behind is found to weigh 12gram . show that these observation are in agreement with a law of conservation of mass._{3}_{ srisaji@yahoo.com}How many atoms of each element are present in 6.3g of nitric acid (HNO

_{3}) ?what are alkalis give 2 examples

The formula of compounds formed by following ions.

Cr

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

^{2+}and NO_{31-}what is the differences between 2H and H

_{2}?Give some examples of octa atomic ion/

Calculate the mass of one atom of sodium.