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Tasya [4]
3 years ago
12

What is the first element in the periodic table?

Chemistry
2 answers:
horsena [70]3 years ago
6 0

Answer:

the first element on the table is Hydrogen

Over [174]3 years ago
5 0
Hydrogen is the first element in the periodic table level 1. Can be found on the top left
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Based on the equation, how many grams of Br2 are required to react completely with 72.4 grams of AlCl3
svlad2 [7]

Answer:  131 g of bromine is required.

Explanation:

The balanced equation will be :

2AlCl_3+3Br_2\rightarrow 2AlBr_3+3Cl_2

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}

moles of AlCl_3

\text{Number of moles}=\frac{72.4g}{133g/mol}=0.544moles

According to stoichiometry :

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Thus 0.544 moles of AlCl_3 require=\frac{3}{2}\times 0.544=0.816moles  of Br_2

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Thus 131 g of bromine is required.

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2 years ago
Susan did an experiment in which she heated cog of CaCO3 to obtain 5.6g of Ca and 4.4g of Cow. is the law of conservation of mas
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no

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