what is the diff between atoms and molecule?

50 names of compounds and their chemical formula

 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)1.032x10²² 

b)1.032 x 10²³

c)3.88 x 10²²

d)1.302 x 10²²

and pls explain

Define mole concept?

what are the limitations of dalton's atomic theory?

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)

gve list of monovalent cations/anions

diavalent cations /anions

trivalent cations/anions.

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?

How much Ca is present in the total amount of Ca(NO₃)₂ that contains 20 g of nitrogen?

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

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

If the atomic weight of carbon were set at 24 amu, what would have been the value of Avogadro's constant?

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

calculate the number of moles in 32g of methane.

valency table

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

calculate the mass of 1 molecule of of oxygen gas : given [at mass of o = 16u,N_A =6.022 * 10²³ mol ^-1]

molecular mass of k2so4.al2(so4)3.24h2o with steps

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

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

give me a list of atomicity of all elements

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

Mn=55.0u, O=16.0u.

prove the formula K.E.=1/2mv²

calculate the number of molecules in 1ml of O₂ at STP

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

• Both $S_{1 }and S_2$ are closed.
• Both $S_{1 }and S_2$ are open.
• $S_1$ is closed but $S_2$ is open.

calculate the molar mass of CO2, H2SO4, NaCl?

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

what is meant by tetra atomic and poly atomic?

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

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

what are polyatomic ions?give examples

 what is the difference between nitrate,nitride,nitrite?

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..

 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

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?

explain dalton's atomic theory and write its drawbacks

Is there any trick to learn Valency?

How to solve numericals based on the mole concept?

(1) the composition of their nuclei.

(2) their electronic configurations.

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

numbers.

What is the difference between O2 and 2O?

An element E forms the following compounds with hydrogen and oxygen,

a) H₂E b) EO₂ c) EO₃

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

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 ?

Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water. What mass of oxygen gas

calculate the number of moles in 22g of carbondioxide?

give 2 examples of polyatomic elements

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

difference between molecular mass formula unit mass.

What does the following denote 2N , N₂ , 2N₂ , N.

Calculate mass of 3.011 X 10 ²³no of nitrogen atoms ( atomic mass of N = 14 u)

how many atoms of oxygen are present in 10.6 g Na2CO3

DEFINE MOLE CONCEPT & ITS FORMULAS?

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a 0.24g sample of compound of oxygen and boronwas found by analysis to contain 0.096g of boron and 0.144g of oxygen. calculate the percentage composition of the compound by weight.

Is there any difference between molar mass and molecular mass?If yes then how

Name one Indian one Foreign ancient thinker, who proposed the atomic nature of matter.

Convert into mole.

(a) 12 g of oxygen gas

(b) 20 g of water

(c) 22 g of carbon dioxide

WHat do the symbols H₂,S & O₄ mean in the formula H₂SO_4?

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

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

Which has the largest number of molecules?

a)54g of N₂O₅

b)36g of H₂O

c)25g of CO₂

d)46g of C₂H₅OH

what are alkalis give 2 examples

What is the difference between 2N and N₂ ?

Which of the following has the maximum number of atoms?

what is the differences between 2H and H₂ ?

Calculate the mass of one atom of sodium.

What is meant by the term chemical formula?