6 mph
It takes him 2 hours to bike 12 miles
12 miles / 2 hours = 6 mph
His speed is 6 mph
Answer: The particles in a solid are packed very close to each other.
Answer:
5.95g
Explanation:
1
= 1000 mL
∴ 100 mL = 100 ÷ 1000 = 0.1 
Volume = <u>0.1 </u>
<u />
Concentration = <u>0.5 M</u>
Concentration =
0.5 = 
No. of moles = 0.5 x 0.1 = <u>0.05 moles</u>
No. of moles =
Mass in 1 mole of KBr = 39 + 80 = 119g (39 is the mass of potassium and 80 is the mass of bromine)
0.05 = 
x = 119 × 0.05 = 5.95g
Answer:
31.3 kJ/mol is the free energy, ΔG, for the overall reaction, A⇌D.
Explanation:
A⇌B,
= 11.9 kJ/mol ...[1]
B⇌C,
= -26.7 kJ/mol ...[2]
C⇌D,
= 7.30 kJ/mol ...[3]
A⇌D,
= ?...[4]
[4] = [1] - [2] - [3] (Using Hess's law)



31.3 kJ/mol is the free energy, ΔG, for the overall reaction, A⇌D.