EVERYDAY MANS ON THE BLOCK. Lol its 4. You got this from Mans Not Hot, didn't you? xD
Answer:
ΔH = - 11758.6 J/mol = - 11.76 kJ/mol
Explanation:
Step 1: Data given
Mass of arsenic tribromide = 54.7 grams
MAss of water = 300.0 grams
Temperature of water = 22.50 °C
Final temperature of water = 24.13 °C
Step 2: Calculate ΔH
Q= m*c*ΔT
⇒with m =the mass of water = 300.0 grams
⇒with c= the specific heat of water = 4.184 J/g°C
⇒with ΔT = the change in temperature of water = T2 - T2 = 24.13 - 22.50 = 1.63 °C
Q = 300 * 4.184 * 1.63
Q = 2046 J
Step 3: Calculate moles AsBr3
Moles AsBr3 = mass / molar mass
Moles AsBr3 = 54.7 grams / 314.634 g/mol
Moles AsBr3 = 0.174 moles
Step 4: Calculate ΔH
ΔH = -Q/moles
ΔH = -2046 J / 0.174 moles
ΔH = - 11758.6 J/mol = - 11.76 kJ/mol
Answer:
It would tend to gain one electron and form a -1 ion. Aluminum is in the fifth column and therefore has 5 electrons in its outermost shell. It would tend to lose three electrons and form a +3 ion.
Explanation:
Lithium is Li
<span>Oxygen gas is O2 </span>
<span>Lithium oxide is Li2O </span>
<span>Unbalanced Equation is Li + O2 --> Li2O </span>
<span>There's one O on right side, 2 Os on left, so make coefficient 2 on right side to balance the oxygens. </span>
<span>Li + O2 --> 2 Li2O </span>
<span>Now balance the lithiums. There are 4 Lis on right side; 1 Li on left, so make Li coefficient 4 to balance the lithiums. </span>
<span>4 Li + O2 --> 2 Li2O </span>
<span>This equation is now fully balanced. </span>
<span>Therefore balanced equation is: </span>
<span>4 Li + O2 --> 2 Li2O</span>