Answer:
B: Earth is not the center of the universe
Explanation:
There are 0.15 ml of the water contains 150 mg of Pb .
Calculation ,
Formula used :
density = mass / volume ( i )
Given mass of the Pb in milligram ( mg ) = 150 mg
Given mass of the Pb in gram ( g ) = 150 ×
= 0.15 gram
Given density = 1.0 g/ml
We have to find volume of water in milliliter ( ml ) .
Putting the value of mass of the Pb , lead and density in equation ( i ) we get the volume of water in milliliter ( ml ) .
density = mass / volume
1.0 g/ml = 0.15 gram / volume
volume = 0.15 gram / 1.0 g/ml = 0.15 ml
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Moles of N2O5 = moles of NO2 * ( 2 moles of N2O5 / 4 moles of NO2
1. an alpha particle
gamma rays are formally massless, positrons and electrons (beta particles) have negligible mass, but alpha particles have about 4 amu of mass
Explanation:
vraiLe point d'ébullition est la température à laquelle une substance passe de la phase liquide à la phase gazeuse