Indicate whether each of the following statements is true or false. (3 pts) always use the exact calculated volume of solvent when purifying a solid by recrystallization. when recrystallizing a sample, you should always add as much solvent as needed to dissolve all of the solid present just before filtering the product, the slurry containing the crystals should be cooled in an ice bath that contains only crushed ice.

In this given case, he volume of hydrogen gas produced = 0.03969 L

Given:

0.52 grams - solid magnesium

Solution:

moles of Mg

=

= 0.216 x 10⁻³  

Reaction -

Mg + 2HCl -----------------> MgCl2 + H2  

  1mol                                                     1mol  

0.216 x 10⁻³                                     0.216 x 10⁻³ mol  

moles of H2

= 0.216 x 10⁻³  

T  = 273 K

P =1 atm

From idea gas P V = n R T

Placing given and known values in ideal gas

1 x V = 0.216 x 10⁻³ x 0.0821 x 273  

V = 0.048 L  

Thus, the volume of hydrogen gas produced = 0.03969 L

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