A Non Contact Force is a force which acts on an object without coming physically in contact with it.[1] The most familiar example of a non-contact force is gravity, which confers weight.[1] In contrast a contact force is a force applied to a body by another body that is in contact with it.[1]
"B. purple" is the correct answer.
Well i believe it is Iron (II) nitrate
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
