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Viktor [21]
3 years ago
10

Please help! I’m on my last attempt

Chemistry
1 answer:
deff fn [24]3 years ago
6 0
First line: The atomic number is the whole number on the periodic table so atomic number 35 means the element is bromine. Thus the element symbol is Br. The atomic number is also the number of protons in the isotope so the number of protons is 35. The mass number is the sum of protons and neutrons in the isotope so the mass number is 35+46 or 81. The mass number gives you the top left number on the nuclear symbol (it will look the same as the one below it except the 79 is an 81). Lastly, the number of electrons is equal to the number of protons in a neutral atom so 35 electrons.
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How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)3?
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We have to calculate the molar mass of  AL(OH)₃
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Therefore, the molar mass of Al (OH)₃ is 78 g/ mol

Now, we calculate the number of moles in 98.3 g of aluminum hydroxide.

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