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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,
50 names of compounds and their chemical formula
What is the mass of 10 moles of water ?
Define mole concept?
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
what are the limitations of dalton's atomic theory?
calculate the no. of atoms in 16u of helium .
gve list of monovalent cations/anions
diavalent cations /anions
the reciprocal of ____________ is called avogram
calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,NA =6.022 * 1023 mol -1]
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
what is the valency of nitrite?
how can we find the valency of polyatomic ions like SO4, SO3, CO3,PO4 etc.?
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.
how to calculate the valency of any compound?
Convert 10g of oxygen gas into no. of moles.
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.
calculate the no. of aluminium ions present in 0.051g of aluminium oxide
give me a list of atomicity of all elements
a sample of ammonia weigh 3.00 g.what mass of sulphur trioxide contain the same number of molecules as are in 3.00g ammonia?
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
prove the formula K.E.=1/2mv2
1.31g of zinc on heating gave 1.63g of white zinc oxide . 2.65g of zinc on reduction with hydrogen gave 2.12g of zinc. show that these are in agreement with the law of constant proportion
calculate the molar mass of CO2, H2SO4, NaCl?
what is meant by tetra atomic and poly atomic?
in HNO3 the valency of hydrogen is 1 and valency of NO3 is 2 then why it is written HNO3 in place of H2NO3
I want all elements' symbols with their valencies and atomicity.
calculate the number of molecules in 1ml of O2 at STP
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 of the following samples contains 2.0 * 1023 atoms ?
a) 8.0 g O2 b) 3.0 g Be c) 8.0 g C d) 19.0 g F2
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
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
What is the difference between O2 and 2O?
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
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?
calculate the number of moles in 32g of methane.
explain dalton's atomic theory and write its drawbacks
1.31g of copper on heating in air gave 1.476g of black oxide of copper [II] . 1.375g of black copper [II] oxide on reduction with hydrogen gave 1.098g of copper . show that these results illustrate the law of constan proportion
Is there any trick to learn Valency?
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?
How to solve numericals based on the mole concept?
Calculate the number of molecules of phosphorus [P4] present in 31 gram of phosphorus.
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?
Calculate mass of 3.011 X 10 23no of nitrogen atoms ( atomic mass of N = 14 u)
Q. How many molecules are present in 1 ml of water..? explain
give 2 examples of polyatomic elements
difference between molecular mass formula unit mass.
Xg of sulphur has as many atoms as in 3g of carbon.the value of X is?
DEFINE MOLE CONCEPT & ITS FORMULAS?
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
How many atoms of each element are present in 6.3g of nitric acid (HNO3) ?
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
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 ?
what are alkalis give 2 examples
what is the differences between 2H and H2 ?
Calculate the number of molecules of phosphorous (p4) present in 248g of solid phosphorous. ( given atomic mass of phosphorous=31.0u No=6.022x1023 per mole )
Calculate the mass of one atom of sodium.
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