Advertisements
Advertisements
प्रश्न
Calculate the molar mass of the following substance:
Ethyne, C2H2
Advertisements
उत्तर
The molar mass of C2H2
= 2 × atomic mass of C + 2 × atomic mass of H
= (2 × 12 + 2 × 1) u
= (24 + 2) u
= 26 u
संबंधित प्रश्न
Fill in the following blanks :
0.5 mole of calcium element has a mass of ............... .
What name is given to the amount of substance containing this number of atoms ?
How many moles of O2 are there in 1.20 × 1022 oxygen molecules ?
A flask contains 3.2g of sulphur dioxide.Calculate the following : The moles of sulphur dioxide present in the flask.
Which of the following would weight the least?
[Atomic masses : Ag = 108, N - 14, O = 16,C = 12]
Consider the following reaction and based on the reaction answer the questions that follow :
\[\ce{(NH4)2Cr2O7 ->[heat] N2(g) + 4H2O(g) + Cr2O3}\]
Calculate :
(i) The quantity in moles of (NH4)2Cr2O7 if 63 gm of (NH4)2Cr2O7 is heated.
(ii) The quantity in moles of nitrogen formed.
(iii) The volume in litres or dm3 of N2evolved at STP.
(iv) The mass in grams of Cr2O3 formed at the same time
[Atomic masses : H = 1, Cr=52, N=14]
Define or explain the term:
Relative atomic mass
How many grams of H2O are present in 0.2 mole of it?
How many grams of CO2 is present in 0.1 mole of it?
Which of the following weighs the least?
