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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
(1) the composition of their nuclei.
(2) their electronic configurations.
(3) give the reason why the two isotopes of magnesium have different mass
calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,NA =6.022 * 1023 mol -1]
what is the atomicity of nitric acid
Calculate the number of molecules of sulphur (S8) 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,
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.
Chlorophyll contains 2.68% of magnesium by mass.Calculate the number of magnesium atoms in 3.00 g of chlorophyll
a) 1.98 * 1021 atoms b) 6.023 * 1023 atoms c) 1.7 * 1020 atoms d) 2.8 * 1022 atoms
calculate the no. of aluminium ions present in 0.051g of aluminium oxide
How much Ca is present in the total amount of Ca(NO3)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.=1/2mv2
From 200 mg of CO2 ,1021 molecules are removed.How many moles of CO2 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 * 1023 molecules of CO2
(b) 1g of H2
(c) 4g of O2
(d) 16 g SO3
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
b)1.032 x 1023
c)3.88 x 1022
d)1.302 x 1022
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
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
= MASS OF CERTAIN GAS (22.4L) AT STP/ MASS OF CERTAIN VOLUME OF H2 GAS (22.4L) AT STP
=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
2.WHICH OF THE FOLLOWING TWO SUBSTANCES HAVE SAME VAPOUR DENSITY?
(D) STARCH, GLUCOSE
Is there any trick to learn Valency?
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?
Calculate mass of 3.011 X 10 23no 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 O2 at STP
GIVE AN EXAMPLE OF 1] DIATOMIC 2] TRIATOMIC MOLECULE OF COMPOUNDS
What is the difference between 2N and N2 ?
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.
How many atoms of each element are present in 6.3g of nitric acid (HNO3) ?
what are alkalis give 2 examples
The formula of compounds formed by following ions.
Cr3+ and SO4 2-
Pb2+ and NO31-
what is the differences between 2H and H2 ?
Give some examples of octa atomic ion/
Calculate the mass of one atom of sodium.
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