I don’t understand how to do this, so please show me how, don’t just tell me what to do without putting in the numbers and assuming you help.
Answer 1
find the energy released, using the specific heat of water of 4.184 J/gC
dH = mCdT
dH = 713g (4.184) 20C
dH = 59,664 Joules
alias 59,664 kiloJoules were released into the water
dH water = + 59.664 kJ (heat absorbed by water)
Reaction dH = – 59.664kJ (was exothermic, released)
=========================================
“…boron is burned to O2(g) to form B2O3(s)”, is the same as…
heat of formation of B2O3(s)
both study this reaction:
2 B(s) & 1.5 O2(g) -> B2O3(s)
to make 1 mol of B2O3, which is the amount that “formation reactions” produce, you need 2 mol of boron. using the molar mass, find the moles of boron used:
1 gram of boron at 10.811 g/mol = 0.0925 mole of boron
===========================
to find Calculate the heat of formation of B2O3(s), find the energy that would be produced by burning 2 moles of boron if the 0.0925 moles of boron released 59.664 kJ:
2 mol B @ -59.664 kJ / 0.0925 mol Boron = -1290 kJ
in this problem 3 sig fig,
your answer is dH = – 1290 kJ/mol B2O3
(less, because it was exothermic)
===
which is close to The standard heat of formation of B2O3(s) is –1263.6 kJ/mol, given at http://cfbstaff.cfbisd.edu/kooj/IB%20-%20Chapter%2…
answer 2
P has an ionic charge of -3 Na + one million Rb + one million There, phosphorus would have the maximum skill point. I think a sodium ion might have a better capacity due to its relative place in the periodic table. The character order of steel can be oxygen can be minimum and αɾꜱεnic can be main steel type.