Answer:
Explanation:
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In this case, since the empirical formula of a chemical compound is determined by assuming the by-mass percentages are masses, we can firstly compute the moles of sulfur and fluorine based on their atomic masses:
Next, we compute the subscript of each element in the formula by dividing each moles by the fewest moles:
Whose molar mass is 127.01 g/mol. Now, we can compute the ratio between the molecular and empirical formulas as follows:
Thus, the molecular formula is:
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Answer:
5 atoms
Explanation:
When a chemical reaction starts with 5 atoms of hydrogen, and the reaction goes into completion, it must give us 5 atoms of hydrogen.
This is in compliance with the law of conservation of mass which states that "in a chemical reaction, matter is neither created nor destroyed but converted from one form to another".
In chemical reactions, bonds are broken and new compounds are formed in the process. The same number of species at the start and end of the reaction must still be the same.
Answer:
1. The reactants are HCl and Na2S
2. The products are H2S and NaCl
3. The balance equation is given below:
2HCl + Na2S —> H2S + 2NaCl
Answer:
1.122 mol/L
Explanation:
Molarity = Moles ÷ Vol in L
First, convert volume from mL to L as,
713.1 mL ÷ 1000 = 0.7131 L
Putting values,
Molarity = 0.8 mol ÷ 0.7131 L
Molarity = 1.122 mol/L