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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
the reciprocal of ____________ is called avogram
Define mole concept?
calculate the number of ions number of oxygen atoms, total charge in 3g of (co3)2
what are the limitations of dalton's atomic theory?
The formula of compounds formed by following ions.
Cr3+ and SO4 2-
Pb2+ and NO31-
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]
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
how can we find the valency of polyatomic ions like SO4, SO3, CO3,PO4 etc.?
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
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)
Calculate the mass of 1 atom of silver and 1 molecule of carbon dioxide.
What is the difference between O2 and 2O?
calculate the no. of aluminium ions present in 0.051g of aluminium oxide
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!
give me a list of atomicity of all elements
Convert 10g of oxygen gas into no. of moles.
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
in HNO3 the valency of hydrogen is 1 and valency of NO3 is 2 then why it is written HNO3 in place of H2NO3
prove the formula K.E.=1/2mv2
10 ml each of 0.1 M Bacl2 and K2SO4 are mixed. which will have the highest concentration in the solution?
calculate the molar mass of CO2, H2SO4, NaCl?
on analysis , it was found that the black oxide of copper , red oxide of copper , litherage, the red oxide of lead and peroxide of lead contain 79.90%, 88.8%, 92.88%, 90.6% and 86.6% respectively of the metal. establish the law of multiple proprotions with the help of data
what is meant by tetra atomic and poly atomic?
I want all elements' symbols with their valencies and atomicity.
how many moles are present in 9g of water
Calculate the number of moles in 52 g of helium gas ?
How many times heavier is one atom of carbon than one atom of oxygen?
what are polyatomic ions?give examples
What do you mean by atomicity of the molecule of an element?
what is the difference between nitrate,nitride,nitrite?
what were the drawbacks of Daltons atomic theory?
calculate the number of molecules in 1ml of O2 at STP
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
calculate the percentage of iron in potassium ferro cyanide K4 (Fe(CN)6)
[Fe=56, S=32, O=16, H=1, K=39, C=12, N=14]
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?
explain dalton's atomic theory and write its drawbacks
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
Is there any trick to learn Valency?
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
How to solve numericals based on the mole concept?
how many atoms are present in H2So4?
Calculate the number of molecules of phosphorus [P4] present in 31 gram of phosphorus.
How many atoms of oxygen are present in 50 g of calcium carbonate?
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 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
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
1. If u melt 100 g of ice will u get the same mass of water?
2.Which of the following rection does not conform to the law of conversation of mass?
A]BURNING OF CANDLE
B]MELTING OF ICE
C]FUSION REACTION OCCURING IN SUN
D]COMBUSTION OF FUEL
3. In chemical rections how does law of conversation of mass contribute in writing cnemical equaions?
give 2 examples of polyatomic elements
difference between molecular mass formula unit mass.
is calcium carbonate a molecular or ionic compound
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
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.
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
What does the following denote 2N , N2 , 2N2 , N.
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 is the ratio by mass of constituting element in following ionic compounds.
1) Magnesium Sulphide
what are alkalis give 2 examples
What do the following abbreviations stand for
what is the differences between 2H and H2 ?
Q1.An element X forms an Oxide with formula "X2O3":-
(a)State the valency of "X".
(b)Write the formula of chloride of "X".
(c)Sulphate of "X".
Calculate the mass of one atom of sodium.
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