Answer:
Noble gas is Ne
Explanation:
Let's make the expression for the Ideal Gases Law at STP
Temperature = 273K
Pressure = 1 atm
1 atm . 1.409L = n . 0.0821 L∙atm/mol∙K . 273K
1.409 L.atm / (0.0821 L∙atm/mol∙K . 273K) = n
0.0628 mol = n
Let's calculate the molar mass to find out the noble gas
1.269 g / 0.0628 m = 20.2 g/m
BE CAREFUL BECAUSE THIS ARE WRONG IN THE STATEMENT.
12.69 g
14.09 L
Answer:
Fe₂O₃ + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂O
Explanation:
Step 1: Write out unbalanced reaction
Fe₂O₃ + H₂SO₄ → Fe₂(SO₄)₃ + H₂O
Step 2: Balance
We need the same number of SO₄²⁻ on each side
Fe₂O₃ + 3H₂SO₄ → Fe₂(SO₄)₃ + H₂O
Now we need the same amount of H⁺ on each side
Fe₂O₃ + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂O
The Periodic Law
Dmitri Mendeleev developed own periodic law with atomic number as the basis for the arrangement. The Periodic Law, also known as "Mendeleev's Law" states, " When elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically." It also describes the properties of the elements as periodic functions of their atomic weights.
Explanation:
idk if that's the actual answer but I hope it helps (:
