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Syllabus

what is the diff between atoms and molecule?

A B

protons 11 17

neutrons 12 18

1. identify the nature of A and B.

2.what is the symbol of ions formed by A and B.

3.write the symbolic notation form of A and B in terms of atomic number and atomic mass.

50 names of compounds and their chemical formula

The formula of compounds formed by following ions.

Cr

^{3+}and SO_{4 2-}^{}Pb

^{2+}and NO_{31-}Define mole concept?

how many moles are present in 9g of water

what are the limitations of dalton's atomic theory?

a,18g of water h2o.

b.18g of oxygen o2.

c. 18g of carbon dioxide CO2.

d.18g of mithane CH4

gve list of monovalent cations/anions

diavalent cations /anions

trivalent cations/anions.

calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,N_{A}=6.022 * 10^{23 }mol^{ -1]}Calculate the number of molecules of phosphorus [P4] present in 31 gram of phosphorus.

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

What is the difference between O2 and 2O?

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

Calculate the molecular mass of potassium permanganate (KMnO4). Atomic masses: K=39.0u,

Mn=55.0u, O=16.0u.

how to calculate the valency of any compound?

1. A sample of ammonia weighs 3 grams. what mass of sulphur trioxide contains the same number of molecules as are in 3 grams of ammonia???

2. A spoonful of sugar contains 6 grams. If you dissolve 2 spoonful of sugar for a cup of tea, calculate the no. of sugar molecules in cup.......

calculate the molar mass of nitric acid HNO3 (H=1,N=14,O=16)

Q.a sample of vitamin c contains 2.48 * 10power 25 atoms.how many moles of oxygen atoms are present in the sample?

Calculate the mass of 1 atom of silver and 1 molecule of carbon dioxide.

How many times heavier is one atom of carbon than one atom of oxygen?

valency table

what is the difference between CO

_{2}and 2CO_{2}?calculate the no. of aluminium ions present in 0.051g of aluminium oxide

S-2 has complete;y filled with K,L and M shells.Find its atomic number..

give me a list of atomicity of all elements

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

a sample of ammonia weigh 3.00 g.what mass of sulphur trioxide contain the same number of molecules as are in 3.00g ammonia?prove the formula K.E.=1/2mv

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

Find the mass of oxygen contained in 1 kg of potassium nitrate (KNO

_{3})a) 475.5g b) 485.5g c) 475.3g d) 485.2g

what is meant by tetra atomic and poly atomic?what is the molar mass of Na

_{2}SO_{3}?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

In which form does atom exist in aqueous solution? Give examples.

what is the difference between nitrate,nitride,nitrite?

Q1.An element X forms an Oxide with formula "X

_{2}O_{3}"_{}:-(a)State the valency of "X".

(b)Write the formula of chloride of "X".

(c)Sulphate of "X".

what were the drawbacks of Daltons atomic theory?

convert into mole...22 g carbon dioxide and 20 g of water.

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

0.4 mole of CO

_{2}(At Mass of C = 12 &O=16 a.m.u) (17.6g)Convert 10g of oxygen gas into no. of moles.

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

calculate the mass of So2 gas which will contain the same number of molecules present in 4.4 g of Co2

why atomic mass of some element are in fraction

what is molecular formula? state with example what information can be derived from a molecular formula.

what is the atomicity of phosphorous?and valency?

_{2}CO_{3}.10H_{2}O).explain dalton's atomic theory and write its drawbacks

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.

Is there any trick to learn Valency?

$N{a}^{+},C{l}^{-},{K}^{+},Na,C{a}^{+2}$

How to solve numericals based on the mole concept?

1. the molecular formula of sulphuric acid is H2SO4: (a) calculate the molecular mass of sulphuric acid. (b) how many moles are there in 9.8g of sulphuric acid ? (c) how many "gram-atoms" of each element are there in 9.8g of sulphuric acid ? (atomic masses: H = 1, S = 32, O = 16) 2. Find the number of molecules present in a drop of chloroform (CHCl3) weighing 0.0239g. (C = 12, Cl = 35.5, H = 1)

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 ?

i) Fe3+ and So4 2- ii) NH4 +1 and CO3 2-

I want only this answer to be solved no other links which shows different:))

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

calculate the number of moles in 22g of carbondioxide?

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)

Calculate mass of 3.011 X 10

^{23}no of nitrogen atoms ( atomic mass of N = 14 u)Q. How many molecules are present in 1 ml of water..? explain

How will you prove experimentally the law of conservation of mass?

give 2 examples of polyatomic elements

1) 10^21 atoms of U-238

2) 10^20 molecules of SO2 gas

I know the step to solve this I.e.

1) n=N/avagadro no.

m= nM = N/avgadro no. M

= (10^21 / 6.022 10^23) 238g

but I am not able to simplify this :( plzz help!! in the nxt part of the ques I am stucking when it comes to simplification...

2) ,....... (10^20 /6.02210^23) 64g

difference between molecular mass formula unit mass.

F2

No2

N2o

C2h6

P4

H2o2

P4o10

O3

Hcl

Ch4

He

Ag

DEFINE MOLE CONCEPT & ITS FORMULAS?

/

Why are Dalton's symbols not used in Chemistry

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

^{207}X_{82}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.

1) calculate the number of molecules in 50g of calcium carbonate

2) calculate the number of moles for the following.

a.64g of oxygen atom

b.24*10 powered by 23 number of oxygen atom

3)calculate the formula unitmass of

a) calcium chloride b) sodium sulphite c) ammonium carbonate

4) calculate the no. of moles sulphur (Sg) present in 16g of solid sulphur

5) write the chemical formula using criss cross method

a)ammonium sulphate b)sodium sulphate c) barium nitrate

GIVE AN EXAMPLE OF 1] DIATOMIC 2] TRIATOMIC MOLECULE OF COMPOUNDS

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

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 is the difference between 2N and N

_{2}?(a)69 g of Na atoms. (b)56 g of He (c) 0.1 mole of atom.

_{3}_{ srisaji@yahoo.com}The element whose gram atomic mass and gram molecular mass are the same is:

a. Argon b. Nitrogen c. Oxygen d. Hydrogen

what are alkalis give 2 examples

indicate the action and reaction in the following case

a man standing on the ground

what is the differences between 2H and H

_{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

Calculate the mass of one atom of sodium.