2Nabr +Ca(oh)2——->CaBr2+2NaOH
Answer:
Latent heat of fusion of the substance is 
Explanation:
Latent heat of fusion denotes amount of energy (heat) per unit mass required to melt a solid material at constant temperature and pressure i.e. at it's melting point
Here amount of heat required = 
Mass of unknown substance being melted = 18.5 kg
So, latent heat of fusion of the substance = (required heat energy to melt)/(mass of the unknown substance) = 
So, latent heat of fusion of the substance is 
Answer: Most ocean pollution begins on land
When large tracts of land are plowed, the exposed soil can erode during rainstorms. Much of this runoff flows to the sea, carrying with it agricultural fertilizers and pesticides. Eighty percent of pollution to the marine environment comes from the land.
Explanation:
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Answer:
A.
Cu Zn K is are metals which form ionic bond with oxygen
Answer:
19.47%
Explanation:
<em>The percentage by mass of </em>
<em> would be </em><em>19.47%</em><em>.</em>
The percentage by mass of a substance in solution is calculated as:

Given that the mole fraction of
= 0.432
The total number of mole fraction of a solution = 1
Hence, mole fraction of water = 1 - 0.432 = 0.568
Mass of water = molar mass x mole
= 98.079 x 0.432 = 42.37 g
Mass of
= molar mass x mole
= 18.02 x 0.568 = 10.24 g
Hence,
<em>%mass of</em>
= 
= 19.47%