Define the term mole.

The mole is the unit of measurement in the International System of Units (SI) for the amount of substance. A mole is the amount of pure substance containing the same number...

(a) The mass of 1 mole of nitrogen atoms is 14g.  (b) The mass of 4 moles of aluminium atoms is (4 × 27)g = 108g  (c) The mass of 10 moles...

(a) Mass of one mole of oxygen atoms = 16g  Then, mass of 0.2 mole of oxygen atoms = 0.2 × 16g = 3.2g  (b) Mass of one mole of water molecule...

Molecular mass of CO2  = 1(C) + 2(O)  = 1(12) + 2(16)  = (1 × 12) + ( 2 × 16)  = 44 u  5 mole of CO2 = 5 × 44  = 220 gm  Molecular mass...

Mass of 1 mole of aluminium atom = the molar mass of aluminium  = 27 g mol–1  An aluminium atom needs to lose three electrons to become an ion, Al3+  For one mole...

(a) Fixed assets are those assets which are invested in a company for a longer time period, generally more than one year. As these assets have long term implication on the...

Let a be the first term and r be the common ratio of the G.P. ∴ a = –3 It is known that, an = arn–1 ∴ a4 = ar3 = (–3) r3 a2...

We know :- an = a +(n-1)d a (m+n) = a + (m+n-1)d (just put m+n in place of n ) --------------(1) Let the first term and common difference of the A.P....

Solution: 12 = a + 2d 106 = a + 49d So, 106-12 = 47d Or, 94 = 47d Or, d = 2 Hence, a = 8 And, n29 = 8 + 28x2 = 64

Solution: As the 7th term exceeds the 5th term by 12, so the 5th term will exceed the 3rd term by 12 as well So, n3 = 16 n5 = 28 n7 =...