Answer:
A charge of -3
Explanation:
If you look on a periodic table you will find that phosphorus is 3 elements away from the nearest noble gas argon. This means that phosphorus would prefer a charge of -3!
Answer:
0.64 moles of carbon dioxide in 28 liters
Depending on the size of the object, that system may describe it
in terms of inches, feet, yards, chains, rods, or miles.
Answer:
Change in temperature, ΔT = 22.8°C,
Reaction is endothermic.
Explanation:
The amount heat is given by the formula;
q = m×c×ΔT
Where, q is the amount of heat
m is the mass of a substance
c is the specific heat capacity
ΔT is the temperature change.
In this case, making ΔT the subject of the formula, we get;
ΔT = q/m×c
but; q = 868 Joules
m = 15.6 g
c = 2.44 J/g°C
Therefore;
ΔT = 868 J/(2.44 J/g°C × 15.6 g)
= 22.8 °C
Therefore, the temperature change for ethanol is 22.8 °C
This means there is an increase in temperature and therefore the reaction is endothermic.