Answer:
Tapeworm, also called cestode, any member of the invertebrate class Cestoda (phylum Platyhelminthes), a group of parasitic flatworms containing about 5,000 species. ... Tapeworms also lack a circulatory system and an organ specialized for gas exchange.
The amount of matter in an object is said to be its mass. The SI base unit of mass is kilograms i.e. .
The mass of the object = (given)
For converting lbs to kg:
So,
Hence, the mass of object in kilograms is .
Answer: C10H8 + 12O2 ----> 10CO2 + 4H2O
Explanation:
To balance this, we have to make sure that the same number of atoms exist at both sides (Conservation of energy)
Note:The reaction is exothermic, giving off heat energy.
Left hand side: C= 10,
H=8,
O= 2×12=24
Right hand side: C= 10×1=10,
H= 4×2=8,
O=10×2=20 (for 10CO2) and 4×1=4 (All equal to 24)
With the above analysis, it is clear that numbers had to be added to molecules to get an equal number of atoms for both sides.
Answer:
i) 16 mL of ethanol
ii) maximum amount recoverable = 15.52 g; percentage recovery = 97%
iii) maximum amount recoverable = 15.1 g
percentage recovery = 94.4%
Explanation:
Solubility = mass/volume
i) mass of ethanol recovered per mL of ethanol when cooled from 78 °C to 0 °C = 0.13 - 0.03 = 0.10 g
Therefore 1.60 g of Y will require a minimum of 1.60 x 1 mL/0.10 g = 16 mL of ethanol
ii) maximum amount of Y that can be recovered is given as :
mass of Y left in solution after recrystallization, x is obtained
0.03 g/mL = x g/16 mL
x = 0.48 g
maximum amount recoverable = 16 - 0.48 = 15.52 g
percentage recovery = (15.52/16) x 100 % = 97%
iii) if 30 mL of ethanol were used:
mass of Y left in solution after recrystallization, x is obtained;
0.03 g/mL = x g/30 mL
x = 0.03 x 30 = 0.9 g
maximum amount recoverable = 16 - 0.9 = 15.1 g
percentage recovery = (15.1/16) x 100% = 94.4%