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what is the diff between atoms and molecule?

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

50 names of compounds and their chemical formula

calculate the number of molecules present in 1 litre of water assuming that density of water is 1g per ml

Define mole concept?

The number of oxygen atoms required to combine with 14 gm of nitrogen to form N2O3( 2 and 3 are in subscript) when 80% of nitrogen is converted to N203( 2 and 3 are in subscript)

what are the limitations of dalton's atomic theory?

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%

gve list of monovalent cations/anions

diavalent cations /anions

trivalent cations/anions.

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

_{3})_{2 }that contains 20 g of nitrogen?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 weighs more:32 g of oxygen,2g of nitrogen3.022x10^23 atoms of C?

how to calculate the valency of any compound?

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.?

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 nitric acid HNO3 (H=1,N=14,O=16)

The formula of compounds formed by following ions.

Cr

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

^{2+}and NO_{31-}Calculate the mass of 1 atom of silver and 1 molecule of carbon dioxide.

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.

valency table

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 number of molecules in 1ml of O

_{2}at STPcalculate the no. of aluminium ions present in 0.051g of aluminium oxide

give me a list of atomicity of all elements

The atomic masses of two elements 'A' and 'B' are 20 and 40 respectively.If x g of 'A' contains y atoms ,how many atoms are present in 2x g of 'B'

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

^{2}how many gram molecules of H2So4 are present in 49g of the acid?

calculate the molar mass of CO2, H2SO4, NaCl?

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

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 meant by tetra atomic and poly atomic?Calculate the number of moles in 52 g of helium gas ?

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

what are polyatomic ions?give examples

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}what is the difference between nitrate,nitride,nitrite?

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

what were the drawbacks of Daltons atomic theory?

if one mole of carbon atoms weighs 12g what is the mass of 1 atom of carbon?? plss explain....

Which has the largest number of molecules?

a)54g of N

_{2}O_{5}b)36g of H

_{2}Oc)25g of CO

_{2}d)46g of C

_{2}H_{5}OHwhy atomic mass of some element are in fraction

what is the atomicity of phosphorous?and valency?

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

_{3})^{2}explain dalton's atomic theory and write its drawbacks

Insulin contains 3.4% of sulphur.Calculate the minimum molecular weight of insulin.

Is there any trick to learn Valency?

How to solve numericals based on the mole concept?

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

What is the difference between O2 and 2O?

calculate the mass of sodium that contain the same no. of atoms as in 4g of calcium.

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

The molecular mass of H

_{2}SO_{4}is 98 u. calculate the number of each element in 294 grams of sulphuric acid.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 ?

give 2 examples of polyatomic elements

two elements x of atomic weight = 75 and y of atomic weight =16 combine to give a compound having 75.8 per cent of x . the formula of the compund...is..

calculate the number of moles in 22g of carbondioxide?

Which of the following has the maximum number of atoms?

difference between molecular mass formula unit mass.

molecular mass of k2so4.al2(so4)3.24h2o with steps

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

how many atoms are present in H2So4?

Calculate mass of 3.011 X 10

^{23}no of nitrogen atoms ( atomic mass of N = 14 u)calculate the number of molecules in 11g of CO2....

sm1 plshelp me with this!!!

DEFINE MOLE CONCEPT & ITS FORMULAS?

/

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

Calculate the number of atoms of gold from one gram of gold

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.

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}atomsGIVE AN EXAMPLE OF 1] DIATOMIC 2] TRIATOMIC MOLECULE OF COMPOUNDS

What are homoatomic and heteroatomic molecules ?

The numbers of moles of BaCO

_{3}which contains 1.5 moles of oxygen atoms iswhat are alkalis give 2 examples

write any 100 ionic compounds with formulas..

What is the difference between 2N and N

_{2}?(ii) 0.1 mole of H2SO4

III) 10 to the power of 23 molecules of CO2gas

(iv) 1 gram of carbon

(v) 10 to the power of 23 atom of calcium

(Atomic masses : Ag =108 u ,N=14u ,S=32u ,Ca=40u)

Experts, please solve the question by specific formulae and please solve it only with help of specific formulae. Plzzzzzzzzzz...........

what is the differences between 2H and H

_{2}?What is the volume of oxygen required for the complete combustion of 4 litres of ethane ?

a) 4 litre b) 12 litre c) 8 litre d) 14 litre

Calculate the mass of one atom of sodium.

write the chemical formula of 50 ionic compounds

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)

in grams