Answer:
5.90
Explanation:
Initial moles of CH3COO- = 10.0/1000 x 0.75 = 0.0075 mol
Moles of HCl added = 5.0/1000 x 0.10 = 0.0005 mol
CH3COO- + HCl => CH3COOH + Cl-
Moles of CH3COO- left = 0.0075 - 0.0005 = 0.007 mol
Moles of CH3COOH formed = moles of HCl added = 0.0005 mol
pH = pKa + log([CH3COO-]/[CH3COOH])
= -log Ka + log(moles of CH3COO-/moles of CH3COOH)
= -log(1.78 x 10^(-5)) + log(0.007/0.0005)
= 5.90
The time it will take for a car travelling 88 km/hr (55mi/hr) to travel 500km would be 3.5 hours.
How? Add 88 + 58.
That'll equal 143, then divide 500 ÷ 143 = 3.5
So, 3.5 is the time that the car will take travelling 88 km/hr trying to reach the destination of 500km.
Answer:
mechanical energy to electrical energy
Explanation:
The water turns the turbine with produces mechanical energy so the generator converts it to electrical energy
Bohr model of an atom illustrates a nucleus with electrons circling around it. This is a useful model for understanding atoms because this clarified that atoms are actually composed of three particles: protons, neutrons and electrons. The first two are located at the center part of an atom (nucleus), while electrons are located at the outer part. Valence electrons of an atom are also vital in the creation of different chemical compounds.
Alpha helix and beta sheets are the secondary structure of protein
