Select Board & Class
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
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
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.
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,NA =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,
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
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
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?
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 H2SO4?
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.
is meant by the term chemical formula?
Xg of sulphur has as many atoms as in 3g of carbon.the value of X is?
Copyright © 2019 Applect Learning Systems Pvt. Ltd. All rights reserved.
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)