The correct answer to answer to your question is
A
Trust me I used the other guys answer and got it wrong this is the answer
The answer is (c.) There is a dense, positively charged mass in the center of an atom
In 1899, Ernest Rutherford, a British physicist conducted a study of the absorption of radioactivity by thin sheets of metal foil. On this experiment, he concluded that all the positive charge and the mass of the atom is concentrated in a small fraction of the total volume of the atom which is called the Nucleus.
The electron is found outside of the nucleus while both the protons and neutrons are found inside of it. <span />
Answer:
Formula is NA2SO4•10H2O
Sodium sulfate decahydrate.
Explanation:
Sodium sulfate is soluble in water. Soduim sulphare form various hydrates, so if the solution is open to the atmosphere for a week at least a lot of the water will have evaporated leaving behind a solid hydrate of Soduim sulfate.
Mass of anhydrous Na2SO4 = molar mass * number of moles
Molar mass = (23*2) + (32*1) + (16*4)
= 146 g/mol
Mass = 146*1
= 146 g of NA2SO4
NA2SO4•nH2O --> Na2SO4 + nH2O
Molar mass of hydrate, NA2SO4.nH2O
= (142 + 18n) g/mol
Mass of NA2SO4.nH2O = (142 + 18n)*1
= (142 + 18n) g
Mass of the residue = 322.2 g
Therefore, 142 + 18n = 322.2
18n = 180.2
n = 10
Formula is NA2SO4•10H2O
Sodium sulfate decahydrate.
0.0588 mol MgSO4 / 0.0588 = 1 mol MgSO4
0.412 mol H2O / 0.0588 = 7 mol H2O
Formula is MgSO4•7H2O
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