Given the following balanced equation, calculate the theoretical yield of h2 in grams if you start with 25.3g zn and have an excess of hcl. zn(s) + 2hcl(aq) → zncl2 (aq) + h2

   The  theoretical  yield  of H₂  in grams   is  =

  calculation

Zn(s)  + 2HCl(aq)  →     ZnCl₂(aq)  +H₂

Step 1:  find the  moles  Zn

moles = mass÷   molar mass

from periodic table the  molar mass  of Zn = 65.4 g/mol

moles is therefore = 25.3 g/65.4 g/mol=0.387   moles

Step 2:  use  the  mole ratio   to determine the  moles of H₂

from given  equation Zn:H₂ = 1:1 therefore the  moles of H₂  is also =0.387  moles

Step 3: find theoretical mass of H₂

mass=  moles×  molar mass

from  periodic table the  molar mass  of H₂ = 1 × 2 = 2 g/mol

mass =0.387  moles ×   2 g/mol =0.774 grams

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .