Answer:
399.88 g/mol
Explanation:
Iron(III) sulfate, is the chemical compound with the formula Fe₂(SO₄)₃. Usually yellow, it is a salt and soluble in water. A variety of hydrates are also known. Solutions are used in dyeing as a mordant, and as a coagulant for industrial wastes.
Answer:
To prepare a 15L 0.920 % NaCl solution we need 138 grams of NaCL
Explanation:
Step 1: Data given
Normal saline is 0.920% (w/v)
⇒ 0.92 g NaCl / 100 mL H2O
Step 2: Calculate grams of NaCl needed to prepare 15 L
We need 0.92 grams of NaCl for 100 mL
We need 9.2 grams of NaCL for 1L
For 15L we need 9.2 grams * 15 = 138 grams of NaCl
To prepare a 15L 0.920 % NaCl solution we need 138 grams of NaCL
Answer:
6.208 mol
Explanation:
Mass of Bromine Liquid = 496g
Number of moles = ?
Relationship between number of moles and mass is given as;
Number of moles = Mass / Molar mass
Molar mass of Bromine = 79.9g
Number of moles = 496 / 79.9 = 6.208 mol
The law that the scientist used to predict that the product of the reaction would be 15.9 g of copper sulfate is the law of conservation of matter (mass)
The law of conservation of matter states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
The law above suggest that the total mass of reactants is equal to the total mass of the product i.e
Total mass of reactant = Total mass of product
Considering the question given above, we obtained the following:
Mass of Cu = 12.7 g
Mass of S = 3.2 g
Mass of CuS = 15.9 g
Cu + S —> CuS
Reactant = Cu + S = 12.7 + 3.2 = 15.9 g
Product = CuS = 15.9 g
From the above illustration, we can see that the total mass of the reactants is equal to the total mass of the product.
Therefore, we can conclude that the scientist used the law of conservation of matter to predict the mass of the product.
Learn more: brainly.com/question/9434062
4.) an element cannot be decomposed by a chemical change, it is a pure substance and no other materials compose it.