How many independent variables are allowed in an experiment
2 answers:
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Answer:
185.5156 g
Explanation:
The reaction of copper sulfate with zinc is shown below as:
Given that :
Amount of copper sulfate = 454 g
Molar mass of copper sulfate = 160 g/mol
The formula for the calculation of moles is shown below:
Thus, moles are:
From the reaction,
1 mole of copper sulfate reacts with 1 mole of zinc
Thus,
2.8375 moles of copper sulfate reacts with 2.8375 moles of zinc
Moles of Zinc that should react = 2.8375 moles
Mass of zinc= moles×Molar mass
Molar mass of zinc = 65.38 g/mol
Mass of zinc = 2.8375 ×65.38 g = 185.5156 g
Answer : The molarity of solution is, 1.216 g/mole
Explanation : Given,
Density of acetic acid = 1.049 g/ml (standard value)
Volume of acetic acid = 16.00 ml
Volume of solution = 230.0 ml
Molar mass of acetic acid =
First we have to calculate the mass of acetic acid.
Now we have to calculate the molarity of solution.
Therefore, the molarity of solution is, 1.216 g/mole
The symbol :
There are two components that accompany an element, the mass number and atomic number
Atoms are composed of 3 types of basic particles (subatomic particles): <em>protons, electrons, and neutrons </em>
The Atomic Number (Z) indicates the number of protons and electrons in an atom of an element.
Atomic number = number of protons = number of electrons ⇒ neutral number
Atomic mass is the sum of protons and neutrons
Atomic Number (Z) = Atomic mass (A) - Number of Neutrons
The element has 71 electrons and a charge of +1 , so
Number of protons = 71 + 1 = 72
Number of protons = the atomic number = 72
The element with atomic number 72 is Hafnium(Hf)
The atomic mass of Hf = 178 g/mol