---------------- is defined as the abundance of a constituent divided by the total volume of a mixture.
Mol
Volume of solute
Concentration
Density
Boron has two stable isotopes, 10B (19%) and 11B (81%). Calculate average atomic weight of boron in the periodic table.
10.8
10.2
11.2
10.0
Which has maximum number of molecules?
7g N2
2 g H2
16 g NO2
16 g O2
How much sugar (C12 H22 O11) will be required if each person on earth is given 1015 mole of sugar per day. Population of earth is 3 × 1010?
1.026 × 1028g
1.26 × 1028g
1.6 × 1028g
1.2 × 1028g
________ are those which depend upon the size and amount of substances.
Extensive
Intensive
Mixture
Compound
Calculate the amount of water (g) produced by the combustion of 16g of Methane?
36g
32g
28g
20g
Calculate the molecular mass of H2O
14u
16u
18u
22u
________ is related to closeness of single measurement to its true value.
Accuracy
Precision
True value
Correct measurement
What is the standard reference to measure a physical quantity?
Joule
Mass
Unit
Weight
________________ consist of only one kind of atoms.
Molecule
Elements
Atoms
