SOME BASIC CONCEPT OF CHEMISTRY [1st ASSIGNMENT ]

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SOME BASIC CONCEPT OF CHEMISTRY

[1^st ASSIGNMENT ]

1.	Vanadium metal is added to steel to impart strength. The density of vanadium is 5.96 g/cm3. Express this in S.I. units (kg/m3).
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Key 1st assignment   (1)5960kg/m3           (2) oxygen present in first sample = 13.38%       (3)  C per g O =0.751 and 0.376

(5)39.352 g mol-1       (6),(a)1.99X10-21       (b)16gms      (c)128g        (d)4.15 X10-23  g    (e) 3.5 X10-3  g  (f) =6.4 X10-3  g

(7)4, 4,4,0.33      (8)X2Y   (9)C3H4N , C6H8N2   (10)KAIS2O8. 12H2O  (11) C 36 g

(12)  (a)4×6.02×1023       (b)1.338 ´ 1022            (c)1.67´1022       (d)(d)3.0115 ×1024    (13) both C and D

(14)  6.022´1022 ,3.346 ´ 1025 , 1.673´ 1021                  (15) (a)36 gm , (b)44.128 amu   (18)X2O5    (19) D

20(a) – (iii), (b) – (i), (c) – (vi), (d) – (ii), (e) – (iv), (f) – (v)   (21) 3,3,3     (22)Na2O2    (23) 2.01 ´ 1021 atoms ,(24)CH,C6H6

(25) MgSO4. 7H2O,(26)  C4H3O2, C8H6O4

BY  MUKESH  SHARMA
DELHI PUBLIC SCHOOL JODHPUR