Answer:
Similarities: the states of the recants
Explanation:
Answer:
15.5 g of MnO
Explanation:
The reaction is:
MnO₂ + 2NaCl + 2H₂SO₄ → Cl₂ + MnSO₄ + Na₂SO₄ + 2H₂O
We use the Ideal Gases Law to determine the moles of produced chlorine
P . V = n . R .T
We convert T° to Abs. value → 22°C + 273 = 295K
We convert Torr to atm → 710 Torr . 1atm /760 Torr = 0.934 atm
We replace: 10 L . 0.934 atm = n . 0.082 . 295K
( 10 L . 0.934 atm ) / (0.082 . 295K) = n → 0.386 moles
As the NaCl and the acid are in excess, we assume the MnO is the limiting reactant, and ratio is 1:1. so:
0.386 moles of chlorine came from 0.386 moles of MnO
We convert moles to mass: 0.386 . 40.3g/mol = 15.5 g
³⁷K and ⁴²K
Both atoms are of the same element. which means they have the same atomic number. Atomic number is the number of protons. Atomic number is characteristic for the element. Both having the same atomic number means they both have the same number of protons
the superscripts are for their masses. Atomic mass is the sum of the protons and neutrons. the 2 K atoms have different masses but same number of protons
which means the number of neutrons vary. These are called isotopes. Isotopes are atoms of the same element with different numbers of neutrons.
therefore An atom of potassium-37 and an atom of potassium-42 differ in their total number of neutrons
The answer is Mercury sulfide, it is composed of the elements mercury and sulfur.
It is a physical change because it could be turned back to just water or just salt through evaporation.
