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what is the diff between atoms and molecule?
50 names of compounds and their chemical formula
Define mole concept?
what are the limitations of dalton's 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
gve list of monovalent cations/anions
diavalent cations /anions
Xg of sulphur has as many atoms as in 3g of carbon.the value of X is?
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 to calculate the valency of any compound?
calculate the number of moles in 32g of methane.
how can we find the valency of polyatomic ions like SO4, SO3, CO3,PO4 etc.?
What does the following denote 2N , N2 , 2N2 , N.
calculate the molar mass of nitric acid HNO3 (H=1,N=14,O=16)
The number of oxygen atoms required to combine with 14 gm of nitrogen to form N2O3( 2 and 3 are in subscript) when 80% of nitrogen is converted to N203( 2 and 3 are in subscript)
Calculate the mass of 1 atom of silver and 1 molecule of carbon dioxide.
calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,NA =6.022 * 1023 mol -1]
How much Ca is present in the total amount of Ca(NO3)2 that contains 20 g of nitrogen?
calculate the no. of aluminium ions present in 0.051g of aluminium oxide
Calculate the molecular mass of potassium permanganate (KMnO4). Atomic masses: K=39.0u,
give me a list of atomicity of all elements
What is the volume of oxygen required for the complete combustion of 4 litres of ethane ?
a) 4 litre b) 12 litre c) 8 litre d) 14 litre
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
Which of the following has the maximum number of atoms?
calculate the molar mass of CO2, H2SO4, NaCl?
If we assume 1/24th part of mass of carbon instead of 1/12th part of it as 1 amu , then mass of 1 mole of a substance will :A) remain changedB) get doubledC) get halvedD)can't be predicted
I want all elements' symbols with their valencies and atomicity.
what is meant by tetra atomic and poly atomic?
Q. How many molecules are present in 1 ml of water..? explain
Calculate the number of moles in 52 g of helium gas ?
calculate the number of molecules in 1ml of O2 at STP
what are polyatomic ions?give examples
what is the difference between nitrate,nitride,nitrite?
If the atomic weight of carbon were set at 24 amu, what would have been the value of Avogadro's constant?
what were the drawbacks of Daltons atomic theory?
in HNO3 the valency of hydrogen is 1 and valency of NO3 is 2 then why it is written HNO3 in place of H2NO3
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
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?
molecular mass of k2so4.al2(so4)3.24h2o with steps
explain dalton's atomic theory and write its drawbacks
Is there any trick to learn Valency?
calculate the number of molecules present in 1 litre of water assuming that density of water is 1g per ml
How to solve numericals based on the mole concept?
What is the difference between O2 and 2O?
Which has the largest number of molecules?
a)54g of N2O5
b)36g of H2O
c)25g of CO2
d)46g of C2H5OH
Why is valency of magnesium 2? How can we find the valency of an atom?
The mass of one atom of an element X is 2.0 x 10-23 g
Calculate the atomic mass of element X
What could element X be
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 moles in 22g of carbondioxide?
Which of the following weighs more:32 g of oxygen,2g of nitrogen3.022x10^23 atoms of C?
Calculate the number of molecules of phosphorus [P4] present in 31 gram of phosphorus.
names of the elements present in the following compounds:
give 2 examples of polyatomic elements
If the aluminium salt of an anion is Al2X3, what is the valency of X and what will be the formula of magnesium salt of X?
difference between molecular mass formula unit mass.
two elements x of atomic weight = 75 and y of atomic weight =16 combine to give a compound having 75.8 per cent of x . the formula of the compund...is..
Calculate mass of 3.011 X 10 23no of nitrogen atoms ( atomic mass of N = 14 u)
DEFINE MOLE CONCEPT & ITS FORMULAS?
Is there any difference between molar mass and molecular mass?If yes then how
(1) the composition of their nuclei.
(2) their electronic configurations.
(3) give the reason why the two isotopes of magnesium have different mass
Convert into mole.
(a) 12 g of oxygen gas
(b) 20 g of water
(c) 22 g of carbon dioxide
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
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 are alkalis give 2 examples
What is the difference between 2N and N2 ?
In an experiment 1.288g of copper oxide was obtained from 1.03g of copper. In another experiment 3.672g of copper oxide obtain from the 2.938g of copper. Show that these figures verify the law of constant proportion.
what is the differences between 2H and H2 ?
which postulate of daltons atomic theory can explain the law of definite proportion?
Calculate the mass of one atom of sodium.
what is meant by symbol of an element?explain with examples
WHat do the symbols H2,S & O4 mean in the formula H2SO4?
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