An ice cube has a temperature of -15.0 °C

The total thermal energy needed to raise the temperature of this ice cube to 0.0 °C and completely melt the ice cube is 5848 J

specific heat capacity of ice =2100J/kg°C

specific latent heat of fusion of ice = 334 000 J/kg
Calculate the mass of the ice cube.

0.018kg

Explanation:

Q=mlf

m=?,Lf=334000J/kg,Q=5848J

5848=mx334000

5848=334000m

divide both sides by 334000

334000m/334000=5848/334000

m=0.018kg

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =