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what is the diff between atoms and molecule?
the reciprocal of ____________ is called avogram
50 names of compounds and their chemical formula
Calculate the molecular mass of potassium permanganate (KMnO4). Atomic masses: K=39.0u,
Define mole concept?
what are the limitations of dalton's atomic theory?
calculate the ratio of atoms present in 5g of magnesium and 5g of iron...?
(Atomic mass of Mg=24u , Fe=56u )
gve list of monovalent cations/anions
diavalent 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,NA =6.022 * 1023 mol -1]
what is the valency of nitrite?
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
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 can we find the valency of polyatomic ions like SO4, SO3, CO3,PO4 etc.?
WHEN COPPER CARBONATE REACTS WITH HYDROCHLORIC ACID, ACCORDING TO ME THE PRODUCTS WILL BE COPPER CHLORIDE AND HYDROGEN CARBONATE.
BUT IT THE TEXTBOOKK ITS WRITTEN THAT THE PRODUCTS OF THIS REACTION IS COPPER CHLORIDE, CARBON DIOXIDE AND WATER. HOW IS THIS POSSIBLE
how to calculate the valency of any compound?
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 molar mass of nitric acid HNO3 (H=1,N=14,O=16)
two grams of hydrogen combine with 16g of oxygen to form water.how many grams of water will be formed?write the name of law of chemical combination which u have used in calculation?
Calculate the mass of 1 atom of silver and 1 molecule of carbon dioxide.
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
calculate the no. of aluminium ions present in 0.051g of aluminium oxide
give me a list of atomicity of all elements
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
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.
prove the formula K.E.=1/2mv2
The formula of compounds formed by following ions.
Cr3+ and SO4 2-
Pb2+ and NO31-
calculate the molar mass of CO2, H2SO4, NaCl?
what is meant by tetra atomic and poly atomic?
I want all elements' symbols with their valencies and atomicity.
What is the difference between O2 and 2O?
Calculate the number of moles in 52 g of helium gas ?
calculate the number of moles in 32g of methane.
what are polyatomic ions?give examples
What do the following abbreviations stand for
what is the difference between nitrate,nitride,nitrite?
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
what were the drawbacks of Daltons atomic theory?
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
HOW MANY MOLES ARE THERE IN 5G OF SODIUM HYDROXIDE
if one mole of carbon atoms weighs 12g what is the mass of 1 atom of carbon?? plss explain....
Convert 10g of oxygen gas into no. of moles.
why atomic mass of some element are in fraction
what is the atomicity of phosphorous?and valency?
For hydrogen peroxide H2O2,
why he 2's are not cancelled.
Why it is not just HO?
What is special about it?
explain dalton's atomic theory and write its drawbacks
Is there any trick to learn Valency?
How to solve numericals based on the mole concept?
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.
Calculate the number of molecules of phosphorus [P4] present in 31 gram of phosphorus.
how many atoms are present in H2So4?
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 ?
Why is valency of magnesium 2? How can we find the valency of an atom?
calculate the number of moles in 22g of carbondioxide?
How much Ca is present in the total amount of Ca(NO3)2 that contains 20 g of nitrogen?
Calculate mass of 3.011 X 10 23no of nitrogen atoms ( atomic mass of N = 14 u)
An element 'X' has a valency 3:
"Please explain the answers also!"
Q. How many molecules are present in 1 ml of water..? explain
calculate the number of molecules present in 1 litre of water assuming that density of water is 1g per ml
give 2 examples of polyatomic elements
difference between molecular mass formula unit mass.
calculate the number of molecules in 1ml of O2 at STP
DEFINE MOLE CONCEPT & ITS FORMULAS?
What is the mass of 10 moles of water ?
Is there any difference between molar mass and molecular mass?If yes then how
calculate number of molecules of oxygen in 6.4g of oxygen?
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.
how many moles are present in 9g of water
GIVE AN EXAMPLE OF 1] DIATOMIC 2] TRIATOMIC MOLECULE OF COMPOUNDS
calculate the no. of atoms in 16u of helium .
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
What is the difference between 2N and N2 ?
Which has the largest number of molecules?
a)54g of N2O5
b)36g of H2O
c)25g of CO2
d)46g of C2H5OH
what are alkalis give 2 examples
what is the molar mass of Na2SO3?
what is the differences between 2H and H2 ?
Calculate the mass of one atom of sodium.
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