Chemistry does not play a major role in
Chemistry does not deal in explaining superconductivity.
One mole is the amount of a substance that contains as many particles or entities as there are atoms in
One mole is the amount of a substance that contains as many particles or entities as there are atoms in exactly 12 g of the 12C isotope
....KOH +.... H3PO4 →.... K3PO4 + ....H2O.. This equation can be balanced by inserting the following in blank spaces
3KOH + H3PO4 → K3PO4 + 3H2O.
We have to prepare a solution of 0.2 M NaOH from the available 1 M solution that is given to us. How much volume of 1M NaOH is required to be taken which contains 0.2 moles of NaOH
M1V1 =M2V2 where M1M1 = 1M V1=?
What is the mass of 1 molecule of O2?
Matter can be classified at the macroscopic or bulk level as
at macroscopic level matter is classified as mixture or pure substances.
A given compound always contains exactly the same proportion of elements by weight. This law is stated by
this law is stated by Proust.
-----CO (g) + ----- H2(g) → ----- C8H18(l) + ----- H2O. This equation can be balanced by inserting the following in blank spaces
There are ____ in 0.101 mm?
What is the mass of 1 mole of O2?
mass of 6.02 x 1023 molecules of O2 = 32g = mass of 1mole of O2.
In a homogeneous mixture,
Homogeneous mixture has a uniform composition throughout.
Avogadro constant is
Avagadros constant is entities in 1 mol = 6.022 x 1023
---- Al + ------ O2 → ------ Al2O3 . This equation can be balanced by inserting the following in blank spaces
20 m/s is the same as:
1km = 1000m
For the reaction
of C4H10 is combusted in 1000 g of O2. The yield of H2OH2O and the limiting agent in the reaction are
moloes of C4H, given = 51.72 mol Moles of O2 = 31.25 mol. Since 2 mol ofC4H10 requires 13 mol of O2 so 51.72 mol of C4H10 require 336.18 mol of O2 but O2 we have is only 31.25 mol therefore O2 is limiting reagent. Therefore 13 mol of O2 gives 10 mol of H2O so 31.25 mol will give 24.038 mol of water = 432 g of water.
Which of the following statements about pure substances correct?
pure substances are elements and compounds . they have fixed composition while mixtures have variable composition.
An empirical formula represents the simplest
empirical formula is the simplest formula of a compound.
------ Ba3N2 +----- H2O → ------ Ba (OH)2 + ------ NH3 . This equation can be balanced by inserting the following in blank spaces
30 microliters is the same as:
How many molecules of H2O are there in 18g of water? (Hint: Avagadro’s Number = 6.02 x 1023 atoms/mol)
18g H2O = 1mol water = 6.02 x 1023 molecules of water
Particles of compounds are
compounds are made when molecules or atoms of two or more different elements combine together in fixed ratio.
Molecular formula shows the.
Molecular formula is the exact no. of atoms present in a molecule of a compound.
The molar mass of CO2 is
Molar mass= 12+2(16)=44g
20 grams is the same as:
78 g of an optically active L-amino acid (A) is treated with NaNO2/HCl at 0º C. 448 cm3 of nitrogen was at STP is evolved. A sample of protein has 0.25% of this amino acid by mass. The molar mass of the protein is