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what is the diff between atoms and molecule?
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
50 names of compounds and their chemical formula
Convert 10g of oxygen gas into no. of moles.
Define mole concept?
what are the limitations of dalton's atomic theory?
what is the valency of nitrite?
gve list of monovalent cations/anions
diavalent cations /anions
Calculate the molecular mass of potassium permanganate (KMnO4). Atomic masses: K=39.0u,
calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,NA =6.022 * 1023 mol -1]
Water gas is an equimolar mixture of hydrogen and carbon monoxide. If 250L of water gas is burnt in air claculate the following assuming both reactants and products are at same temperature and pressure.
2CO + O2 = 2CO2; 2H2 + O2 = 2H2O
1. Volume of carbon dioxide produced
2. Volume of steam formed
a)62.5l b)250l c)125l d)375l
3. Volume of oxygen used up
a)250l b)125l c)75l d)500l
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
the reciprocal of ____________ is called avogram
how can we find the valency of polyatomic ions like SO4, SO3, CO3,PO4 etc.?
in HNO3 the valency of hydrogen is 1 and valency of NO3 is 2 then why it is written HNO3 in place of H2NO3
how to calculate the valency of any compound?
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.
calculate the molar mass of nitric acid HNO3 (H=1,N=14,O=16)
What is the mass of 10 moles of water ?
Calculate the mass of 1 atom of silver and 1 molecule of carbon dioxide.
calculate the no. of atoms in 16u of helium .
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
HOW MANY MOLES ARE THERE IN 5G OF SODIUM HYDROXIDE
prove the formula K.E.=1/2mv2
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
calculate the molar mass of CO2, H2SO4, NaCl?
calculate the number of moles in 32g of methane.
what is meant by tetra atomic and poly atomic?
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?
calculate the ratio of atoms present in 5g of magnesium and 5g of iron...?
(Atomic mass of Mg=24u , Fe=56u )
what were the drawbacks of Daltons atomic theory?
144 grams of pure water is decomposed by passing electricity. 16 grams of hydrogen and 128 grams of oxygen are obtained. Which chemical law is illustrated by this statement?
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
What is the difference between O2 and 2O?
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 meaning of "parmanu"???
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 many atoms are present in H2So4?
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 ?
Sample A contains one gram molecule of oxygen molecule and sample B contains one mole of oxygen molecule. What is the ratio of the number of molecules in both the samples.
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)
Give some examples of octa atomic ion/
Q. How many molecules are present in 1 ml of water..? explain
The formula of compounds formed by following ions.
Cr3+ and SO4 2-
Pb2+ and NO31-
give 2 examples of polyatomic elements
difference between molecular mass formula unit mass.
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.
DEFINE MOLE CONCEPT & ITS FORMULAS?
How much Ca is present in the total amount of Ca(NO3)2 that contains 20 g of nitrogen?
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
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 do you mean by atomicity of the molecule of an element?
calculate the number of ions number of oxygen atoms, total charge in 3g of (co3)2
what are alkalis give 2 examples
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 is the differences between 2H and H2 ?
Calculate the mass of one atom of sodium.
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