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what is the diff between atoms and molecule?

Solve this :Q. 0.1 mole of chromium sulphide will contain (valency of Cr = 3, valency of sulphide = -2):

a) 0.1g atom of Cr

^{+3}and 0.2g atom of S^{-2}b) 0.1g atom of Cr

^{+3}and 0.1g atom of S^{-2}c) 0.2g atom of Cr+

^{3}and 0.3g atom of S^{-2}d) 0.3g atom of Cr

^{+3}and 0.3g atom of S^{-2}50 names of compounds and their chemical formula

Define mole concept?

Q. What percentage of oxygen is present in the compound CaCO

_{3}3Ca_{3}(PO_{4})_{2}?(A) 23.3% (B) 45.36% (C) 41.94 % (D) 17.08%

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

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

gve list of monovalent cations/anions

diavalent cations /anions

trivalent 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 (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?

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 , N

_{2}, 2N_{2}, 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.

valency table

calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,N_{A}=6.022 * 10^{23 }mol^{ -1]}How much Ca is present in the total amount of Ca(NO

_{3})_{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,

Mn=55.0u, O=16.0u.

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.=1/2mv

^{2}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

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 O

_{2}at STPwhat 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 * 10

^{21}atoms b) 6.023 * 10^{23}atoms c) 1.7 * 10^{20}atoms d) 2.8 * 10^{2}^{2}atomsif 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 N

_{2}O_{5}b)36g of H

_{2}Oc)25g of CO

_{2}d)46g of C

_{2}H_{5}OHWhy 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}gCalculate 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.

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

(a) Quick lime

(b) Hydrogen bromide

(c) Baking powder

(d) Potassium sulphate

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

^{23}no 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

^{24}Mg_{12}and^{26}Mg_{12}are symbols of two isotopes of magnesium. Compare the atoms of these isotopes with respect to :(1) the composition of their nuclei.

(2) their electronic configurations.

(3) give the reason why the two isotopes of magnesium have different mass

numbers.

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

a...FeSO4

b...CH

_{3}COOKwhat are alkalis give 2 examples

What is the difference between 2N and N

_{2}?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 H

_{2}?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

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)

WHat do the symbols H

_{2},S & O_{4}mean in the formula H_{2}SO_{4?}