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Chemistry Level 2

Find ( M A + M B + M C + M D ) − ( M E + M F + M G ) (M_ A+M_B+M_C+M_D)-(M_E+M_F+M_G) .

Notations and Assumptions:

  • M R M_R denotes molecular mass of the compound R R

  • Molecular mass of various element should be rounded off to nearest integer. For example: Mass of S o d i u m = 22.989 u Sodium=22.989u , should be taken 23 u 23u

  • Mass of C h l o r i n e = 35.5 u Chlorine=35.5u


The answer is 169.

Harsh Shrivastava by Harsh Shrivastava , 17, India

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1 solution

Poca Poca
Jul 6, 2018

A is M g S O 4 MgSO_4

B is H 2 H_2

C is M g ( O H ) 2 Mg(OH)_2

D is N a 2 S O 4 Na_2SO_4

E is M g O MgO

F is H 2 O H_2O

G is M g C l 2 MgCl_2

The given expression evaluates to 169 u \boxed{169u}

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