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9966 [12]
3 years ago
8

Tropical fish owners must keep the water in the tank from getting too warm or the fish will die. Why is this true?1.) There is t

oo much surface area in the water.2.) The water evaporates too quickly.3.) The dissolution of oxygen increases.4.) The dissolution of the oxygen decreases.
Chemistry
1 answer:
Irina-Kira [14]3 years ago
3 0
Option 4 or the dissolution of the oxygen decreases
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What mass of oxygen is contained in a 5.8 g sample of NaHCO3?
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What is the molar mass of (NH4)2S
Anastaziya [24]

Answer:

This compound is Ammonium Sulphide and has molar mass 68 g/mol.

Explanation:

  • Molar Mass : It is the mass of 1 mole of the substance and in grams.Its units are gram/mole.
  • It is numerically equal to mass of the substance in atomic mass units

How to calculate Molar mass :

(NH_{4})_{2}S = 2(atomic\ mass\ of\ N + 4\times mass\ of\ H ) +atomic\  mass\ of\ S

(NH_{4})_{2}S = 2(14 + 4(1) ) + 32

(NH_{4})_{2}S = 2(14 + 4 ) + 32

(NH_{4})_{2}S = 2(18) + 32

(NH_{4})_{2}S = 36 + 32

(NH_{4})_{2}S = 68 grams/mole

Molar mass of Ammonium sulphide is 68 g/mol

8 0
3 years ago
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