The specific heat of mercury is 140 J/kg K. Its heat of vaporization is 2.06 x 105 J/kg. How much heat is needed to heat 1.0 kg of mercury metal
from 10.00 C to its boiling point and vaporize it completely? The boiling
point of mercury is 3570 C.

A. 49,000 J
B. 260,000 J
C. 310,000 J
D. 360,000 J

  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

d. air pressure decreases as altitude increases.

answera compound;

b. a lightning bug, plug of grass, and a worm