When students work in a chemistry lab, the location of which item would be the most important for each student to know?
a. broom and dust pan, in case the student needs to sweep up broken glass
b. baking soda, in case the student needs to neutralize an acid spill
c. ice maker, in case the student needs to cool off hot glassware
d. safety shower, in case a chemical is spilled on the student’s body

The correct Option is (d).

Explanation:

The location of safety shower and other equipment will help  in following ways:

Hence , option (D) is correct .

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂

hypothesising or postulating