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what is the diff between atoms and molecule?

calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,N_{A}=6.022 * 10^{23 }mol^{ -1]}50 names of compounds and their chemical formula

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)

Define mole concept?

what are the limitations of dalton's atomic theory?

which postulate of daltons atomic theory can explain the law of definite proportion?

gve list of monovalent cations/anions

diavalent cations /anions

trivalent cations/anions.

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.

Calculate the number of molecules of sulphur (S

_{8}) 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?

how can we find the valency of polyatomic ions like SO4, SO3, CO3,PO4 etc.?

What is the difference between O2 and 2O?

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.

valency table

calculate the no. of aluminium ions present in 0.051g of aluminium oxide

give me a list of atomicity of all elements

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 ?

From 200 mg of CO

_{2},10^{21}molecules are removed.How many moles of CO_{2}are left ?a) 0.288 b) 2.88 c) 0.00288 d) 0.0288

42. The ratio of number of electrons in N shell of A and M shell of B with

atomic numbers 40 and 32 respectively is

(1) 5 : 3 (2) 9 : 5 (3) 5 : 9 (4) 5 : 4

prove the formula K.E.=1/2mv

^{2}calculate the molar mass of CO2, H2SO4, NaCl?

I want all elements' symbols with their valencies and atomicity.

what mass of oxygen will contain same number of molecules as 2.5moles ofchlorine,Cl2 ?

what is meant by tetra atomic and poly atomic?Which of the following weighs more:32 g of oxygen,2g of nitrogen3.022x10^23 atoms of C?

Calculate the number of moles in 52 g of helium gas ?

Calculate the number of molecules of phosphorus [P4] present in 31 gram of phosphorus.

what are polyatomic ions?give examples

what is the difference between nitrate,nitride,nitrite?

_{3}) when heated produced 1.92 of oxygen and the residue (KCL) left behind weighed 2.96g.Show that these results illustrate the Law of Conservation of Mass.pls give d ans. fastwhat were the drawbacks of Daltons 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

a)1.032x10

^{22 }b)1.032 x 10

^{23}c)3.88 x 10

^{22}d)1.302 x 10

^{22}and pls explain

define mole. What are the two things that a mole represents

if one mole of carbon atoms weighs 12g what is the mass of 1 atom of carbon?? plss explain....

what is the atomicity of phosphorous?and valency?

why atomic mass of some element are in fraction

explain dalton's atomic theory and write its drawbacks

How much Ca is present in the total amount of Ca(NO

_{3})_{2 }that contains 20 g of nitrogen?Is there any trick to learn Valency?

obtained.Which chemical law is illustrated by this statement?

What does the following denote 2N , N

_{2}, 2N_{2}, N.How to solve numericals based on the mole concept?

calculate the number of molecules present in 1 litre of water assuming that density of water is 1g per ml

Why is valency of magnesium 2? How can we find the valency of an atom?

WHat do the symbols H

_{2},S & O_{4}mean in the formula H_{2}SO_{4?}calculate the number of moles in 22g of carbondioxide?

In an experiment, 4.90 g of copper oxide was obtained from 3.92 g of copper. In another experiment, 4.55g of copper oxide gave, on reduction, 3.64 g of copper. Show with the help of calculations that these figures verify the law of constant proportions.

give 2 examples of polyatomic elements

Calculate mass of 3.011 X 10

^{23}no of nitrogen atoms ( atomic mass of N = 14 u)The mass of one atom of an element X is 2.0 x 10

^{-23}gCalculate the atomic mass of element X

What could element X be

difference between molecular mass formula unit mass.

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

Why is the valency of Phosphate three? explain.

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.

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?

Q. How many molecules are present in 1 ml of water..? explain

What is the difference between an atom of hydrogen and an molecule of hydrogen ?

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 * 10

^{21}atoms b) 6.023 * 10^{23}atoms c) 1.7 * 10^{20}atoms d) 2.8 * 10^{2}^{2}atomswhat are alkalis give 2 examples

What is the difference between 2N and N

_{2}?in HNO3 the valency of hydrogen is 1 and valency of NO3 is 2 then why it is written HNO3 in place of H2NO3

what is the differences between 2H and H

_{2}?CALCULATE THE MASS OF NITROGEN WHICH CONTAINS SAME NUMBER OF MOLECULES AS ARE PRESENT IN 4.4GM OF CO

_{2}?Calculate the mass of one atom of sodium.

Give the names of the elements present in the following compounds:

(a) Quick lime

(b) Hydrogen bromide

(c) Baking powder

(d) Potassium sulphate

i) 46 grams of Na atoms (NUMBER FROM MASS)

ii) 8 grams of O

_{2}molecules (NUMBER OF MOLECULE FROM MASS)iii) 0.1 mole of carbon atoms (NUMBER OF GIVEN MOLES)

(ii) 0.1 mole of H2SO4

III) 10 to the power of 23 molecules of CO2gas

(iv) 1 gram of carbon

(v) 10 to the power of 23 atom of calcium

(Atomic masses : Ag =108 u ,N=14u ,S=32u ,Ca=40u)

Experts, please solve the question by specific formulae and please solve it only with help of specific formulae. Plzzzzzzzzzz...........