Answer:
If you're talking about a Sulfur ion, there are 13 electrons.
Explanation:
Sulfur originally had 16 electrons in its atom.
A charge of +3 means that sulfur must have lost 3 electrons, and therefore needs to gain back 3 electrons to achieve its atomic configuration.
Answer:
80g/mol is the molar mass of the metal
Explanation:
A divalent metal M reacts with HCl as follows:
M + 2HCl → MCl₂ + H₂
The excess of HCl is titrated with NaOH. Thus, we can solve the moles of HCl that reacts with the metal and the moles of the metal. As the atomic weight is the ratio between the mass and moles of the atom:
<em>Moles NaOH:</em>
0.0546L * (0.22mol / L) = 0.0120 moles NaOH = Moles HCl in excess
<em>For NaOH and HCl solutions, Normality is the same than molarity.</em>
<em />
<em>Moles HCl added:</em>
0.100L * (1.28mol / L) = 0.128 moles HCl * (50mL / 200mL) = 0.032 moles
<em>Moles HCl in that react:</em>
0.032 moles - 0.012 moles = 0.020 moles HCl
<em>Moles M:</em>
0.020 moles HCl * (1mol M / 2 mol HCl) = 0.010 moles M
<em>Molar mass M:</em>
0.8g / 0.010mol =
<h3>80g/mol is the molar mass of the metal</h3>
Answer:
2.9g/cm^3
Explanation:
We're given that the mass of the system before the rock was added was
120g
. The mass after the rock was added was 250g, so the rock's mass is 130g.
The initial volume of water in the graduated cylinder was
30
mL
, and the volume after the rock was added read 75mL
, so the rock's volume is 45mL
Density = Mass over Volume.
AKA. 130g/45mL
2.9g/cm^3 (rounded)
Mass number = protons + neutrons
protons = electrons
so 35 electrons = 35 protons
So 35 protons + 45 neutrons =
80
The element is Bromine with the symbol: Br
Answer: 4.9 + 3.822 = 8.7
Explanation: Hope this helps
