what is the diff between atoms and molecule?

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

Mn=55.0u, O=16.0u.

50 names of compounds and their chemical formula

Define mole concept?

how many moles are present in 9g of water

what are the limitations of dalton's atomic theory?

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 * 10²³ mol ^-1]

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

The formula of compounds formed by following ions.

Cr³⁺ and SO_{4 ^2-}

Pb²⁺ and NO_3^1-

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

how to calculate the valency of any compound?

What is the difference between O2 and 2O?

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

on analysis , it was found that the black oxide of copper , red oxide of copper , litherage, the red oxide of lead and peroxide of lead contain 79.90%, 88.8%, 92.88%, 90.6% and 86.6% respectively of the metal. establish the law of multiple proprotions with the help of data

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

HOW MANY MOLES ARE THERE IN 5G OF SODIUM HYDROXIDE

valency table

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

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

give me a list of atomicity of all elements

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

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

prove the formula K.E.=1/2mv²

Convert 10g of oxygen gas into no. of moles.

calculate the molar mass of CO2, H2SO4, NaCl?

what is meant by tetra atomic and poly atomic?

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.

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

the reciprocal of ____________ is called avogram

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

what are polyatomic ions?give examples

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 difference between nitrate,nitride,nitrite?

WHEN COPPER CARBONATE REACTS WITH HYDROCHLORIC ACID, ACCORDING TO ME THE PRODUCTS WILL BE COPPER CHLORIDE AND HYDROGEN CARBONATE.

CUCO3+HCL=CUCL+HCO3

BUT IT THE TEXTBOOKK ITS WRITTEN THAT THE PRODUCTS OF THIS REACTION IS COPPER CHLORIDE, CARBON DIOXIDE AND WATER. HOW IS THIS POSSIBLE

 what were the drawbacks of Daltons atomic theory?

Calculate the mass of (a) 0.1 mole of KNO3 (b) 1 x 10 23 (c) 112 cm3 molecule of methane of hydrogen at STP

 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

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?

calculate the percentage of iron in potassium ferro cyanide K₄ (Fe(CN)₆)

[Fe=56, S=32, O=16, H=1, K=39, C=12, N=14]

explain dalton's atomic theory and write its drawbacks

is calcium carbonate a molecular or ionic compound

Is there any trick to learn Valency?

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!

How to solve numericals based on the mole concept?

how many atoms are present in H2So4?

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

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 ?

what are the first 20 elements in the periodic table in order along with thier atomic and mass number?

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

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)

• Find the number of Protons and Neutrons in the nucleus of an atom of an element x which is represented as²⁰⁷X₈₂

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

give 2 examples of polyatomic elements

calculate the number of moles in 32g of methane.

difference between molecular mass formula unit mass.

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

DEFINE MOLE CONCEPT & ITS FORMULAS?

/

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

What do the following abbreviations stand for

O

2O

O₂

3O₂

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.

 For hydrogen peroxide H2O2,

why he 2's are not cancelled.

Why it is not just HO?

What is special about it?

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

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

a) H₂E b) EO₂ c) EO₃

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. 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)

• Which has more number of atoms? 100g of N2 or 100g of NH₃

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Calculate the number of the constituent atoms in 53 grams of Na2CO3( At. massses of Na= 23u , C=12u, O =16u)

I did the questions something like this-

We know that,

n = mass/ molar mass and n= no. of particles/ 6.022 * 10 to the power 23

where n is the no. of moles

Now, from above two equations, we can say that, mass/molar mass=no. of particles/6.022 * 10 to the power 23

what are alkalis give 2 examples

what is the differences between 2H and H₂ ?

Calculate the mass of one atom of sodium.