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1 2 mole 19 (D) 6.023x1024 Which sample contains the largest number of atoms: (A) 1 mg of C4H10 (B) 1mg of N2 (C) Img of Na (D) ImL of water The atomic weight of

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Q1

A water contains the following dissolved ions.
[Na+]=56mg/L;[Ca2+]=40mg/L;
[Mg2+]=30mg/L;[Al3+]=3mg/L;
[HCO3]=190mg/L;[Cl]=165mg/L;
Water pH is 7.
Atomic weights:
Ca=40,Mg=24,Al=27,H=1,C=12,O=16,Na=23,Cl=35.5

The non-carbonate hardness of the sample in mg/L as CaCO3 is


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One mole of solute NaCl is dissolved in liter water.

the molarity of the solution is

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975 mL of a water sample contains 1 mg CaCl2 and 1 mg MgCl2. Total hardness of water (in ppm) is
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