Question

UUU UUTUUI
04. Calculate
(a) The number of molecules present in 1 g of water.
(b) The volume of 0.2 mole of sulphur dioxide at STP.
05. The combination of elements to form compounds is governed by the laws of chemical combination.
(a) Hydrogen combines with oxygen to form compounds, namely water and hydrogen peroxide. State and
illustrate the related law of chemical combination,
(b) What is meant by 'limiting reagent' in a chemical reaction?
(c) 28 g of nitrogen is mixed with 12 g of hydrogen to form ammonia as per the reaction,
N2 + 3H2 → 2NH3.
Which is the 'limiting reagent' in this reaction.
[Atomic masses : N= 14, H= 1]
06. (a) Mole is a very large number to indicate the number of atoms, molecules, etc. Write another name for one
mole.
(b) i) How the molecular formula is different from that of the Empirical formula?
ii) An organic compound on analysis gave the following composition.
Carbon = 40%, Hydrogen = 6.66% and oxygen = 53.34%. Calculate its molecular formula if its molecular
mass is 90.
07. (a) Atoms have very small mass and so usually the masses of atoms are given relative to a standard called atomic
mass unit.
What is Atomic Mass Unit (AMU)?
(b) In a reaction A + B2- → AB2, identify the limiting reagent in the reaction mixture containing 5 mol A and
2.5 mol B.
(c) Calculate the mass of NaOH required to make 500 mL of 0.5 M aqueous solution
(Molecular mass of NaOH=40).
8. Hydrogen combines with oxygen to form two different compounds, namely, water (H2O) and hydrogen peroxide
(H2O2).
(a) Which law is obeyed by this combination?
(b) State the law
(c) How may significant figures are present in the followings?
BHABIT​

Answer 1

Answer:

dimensional

Explanation:

I am not sure but it is a word that should be after standard