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

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

Define mole concept?

what are the limitations of dalton's atomic theory?

gve list of monovalent cations/anions

diavalent cations /anions

trivalent cations/anions.

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

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

The formula of compounds formed by following ions.

Cr³⁺ and SO_{4 ^2-}

Pb²⁺ and NO_3^1-

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

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

how to calculate the valency of any compound?

A highly reactive element X is stored under water .It readily reacts with oxygen of air to give a compound Y which dissolves in water .The aqueous solution of Y changes blue litmus to red.The element X is a) Na b) S c) P d) K

 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

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.

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

calculate the number of moles in 32g of methane.

prove the formula K.E.=1/2mv²

 For hydrogen peroxide H2O2,

why he 2's are not cancelled.

Why it is not just HO?

What is special about it?

calculate the molar mass of CO2, H2SO4, NaCl?

what is meant by tetra atomic and poly atomic?

the reciprocal of ____________ is called avogram

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

how to find the number of nitrogen atoms present in 1.5 moles of nitrogen

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

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!

what are polyatomic ions?give examples

 what is the difference between nitrate,nitride,nitrite?

HOW MANY MOLES ARE THERE IN 5G OF SODIUM HYDROXIDE

 what were the drawbacks of Daltons atomic theory?

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

 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

What is the difference between O2 and 2O?

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

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

1.31g of zinc on heating gave 1.63g of white zinc oxide . 2.65g of zinc on reduction with hydrogen gave 2.12g of zinc. show that these are in agreement with the law of constant proportion

why atomic mass of some element  are in fraction

what is the atomicity of phosphorous?and valency?

 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?

explain dalton's atomic theory and write its drawbacks

which of the following is an example of neutral oxide:

1.Fe2O3

2,.Al2O3

3.CO

4.NO2

Is there any trick to learn Valency?

How to solve numericals based on the mole concept?

calculate the ratio of atoms present in 5g of magnesium and 5g of iron...?

(Atomic mass of Mg=24u , Fe=56u )

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 do the following abbreviations stand for

O

2O

O₂

3O₂

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

calculate the number of moles in 22g of carbondioxide?

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

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

two grams of hydrogen combine with 16g of oxygen to form water.how many grams of water will be formed?write the name of law of chemical combination which u have used in calculation?

give 2 examples of polyatomic elements

What is the mass of 10 moles of water ?

difference between molecular mass formula unit mass.

how many gram molecules of H2So4 are present in 49g of the acid?

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 are Dalton's symbols not used in Chemistry

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.

 The ratio by the number of atoms for water will always be H : O = 2 : 1. Thus, 18 g of water contains 2 g of hydrogen and 16 g of oxygen.

i can understand that the ratio of h = 2 so  2 g of hydrogen contained in the water but why we have taken the oxygen as 16 g but it is given that the  ratio of o = 1 pls explain i need you help experts pls.  

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 * 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. 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.

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

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calculate the mass(in grams) of the iron sulphide formed when 5.6 of iron combines with 3.2g of sulphur

what are alkalis give 2 examples

Name a) element, B) an isotope of the element, used as atomic mass unit.

what is the differences between 2H and H₂ ?

Calculate the mass of one atom of sodium.