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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
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
Define mole concept?
what are the limitations of dalton's atomic theory?
gve list of monovalent cations/anions
diavalent cations /anions
Convert 10g of oxygen gas into no. of moles.
calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,NA =6.022 * 1023 mol -1]
The formula of compounds formed by following ions.
Cr3+ and SO4 2-
Pb2+ and NO31-
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.?
how to calculate the valency of any compound?
A highly reactive element X is stored under water .It readily reacts with oxygen of air to give a compound Y which dissolves in water .The aqueous solution of Y changes blue litmus to red.The element X is a) Na b) S c) P d) K
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
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.
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
the reciprocal of ____________ is called avogram
prove the formula K.E.=1/2mv2
calculate the number of moles in 32g of methane.
calculate the molar mass of CO2, H2SO4, NaCl?
For hydrogen peroxide H2O2,
why he 2's are not cancelled.
Why it is not just HO?
What is special about it?
what is meant by tetra atomic and poly atomic?
I want all elements' symbols with their valencies and atomicity.
how to find the number of nitrogen atoms present in 1.5 moles of nitrogen
Calculate the number of moles in 52 g of helium gas ?
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
what are polyatomic ions?give examples
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!
what is the difference between nitrate,nitride,nitrite?
what were the drawbacks of Daltons atomic theory?
HOW MANY MOLES ARE THERE IN 5G OF SODIUM HYDROXIDE
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 times heavier is one atom of carbon than one atom of oxygen?
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....
in HNO3 the valency of hydrogen is 1 and valency of NO3 is 2 then why it is written HNO3 in place of H2NO3
why atomic mass of some element are in fraction
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
what is the atomicity of phosphorous?and valency?
explain dalton's atomic theory and write its drawbacks
what happens in the reaction flask?
do you think that a chemical reaction has taken place?
why should we put a cork on the mouth of the flask?
does the mass of the flask and it s contents change?
Is there any trick to learn Valency?
which of the following is an example of neutral oxide:
How to solve numericals based on the mole concept?
Calculate the number of molecules of phosphorus [P4] present in 31 gram of phosphorus.
calculate the ratio of atoms present in 5g of magnesium and 5g of iron...?
(Atomic mass of Mg=24u , Fe=56u )
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?
What do the following abbreviations stand for
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)
What is the mass of 10 moles of water ?
Q. How many molecules are present in 1 ml of water..? explain
how many gram molecules of H2So4 are present in 49g of the acid?
give 2 examples of polyatomic elements
difference between molecular mass formula unit mass.
DEFINE MOLE CONCEPT & ITS FORMULAS?
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?
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.
Why are Dalton's symbols not used in Chemistry
GIVE AN EXAMPLE OF 1] DIATOMIC 2] TRIATOMIC MOLECULE OF COMPOUNDS
The ratio by the number of atoms for water will always be H : O = 2 : 1. Thus, 18 g of water contains 2 g of hydrogen and 16 g of oxygen.
i can understand that the ratio of h = 2 so 2 g of hydrogen contained in the water but why we have taken the oxygen as 16 g but it is given that the ratio of o = 1 pls explain i need you help experts pls.
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 ?
1. how many individual atoms are there in each of the following ? (a) 32 moles of sulphur (b) 32g of sulphur (c) 32u of sulphur (S = 32) 2. how many moles are there in each of the following ? (a) 280g of silicon (b) 12.044 x 10^25 atoms of phosphorus (c) 19.0 atoms of fluorine 3. One mole of zinc atoms weigh 65g. calculate the weight of one atom of zinc.
calculate the mass(in grams) of the iron sulphide formed when 5.6 of iron combines with 3.2g of sulphur
what are alkalis give 2 examples
Name a) element, B) an isotope of the element, used as atomic mass unit.
what is the differences between 2H and H2 ?
Calculate the mass of one atom of sodium.
calculate the no. of atoms in 16u of helium .
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