Answer:
J.J. Thomson
Explanation:
According to my book and wiki, Historically, the mass of the electron was determined directly from combining two measurements. The mass-to-charge ratio of the electron was first estimated by Arthur Schuster in 1890 by measuring the deflection of "cathode rays" due to a known magnetic field in a cathode ray tube. It was seven years later that J. J.
Please correct me if I'm wrong.
Answer:
Xenon- 131
Explanation:
Iodine- 131 ------------------> Xenon -131 + Beta particle
A radioactive half-life talks about the amount of time
it takes for half of the original isotope to deteriorate.
The solution for this problem is:
Half-life (lst order
reaction) = ln2 over k <span>
<span>so half-life = .693 over 3.25 = .213 day is the
half-life for the metabolism reaction</span></span>
<span> </span>
<span>Avogadro's constant/number is 6.022 Ă— 10^23 molecules for every 1 mole of substance.
And reaction produces 0.875 moles of h2o.
So,
Number of molecules produced = Avagardo's number x Number of moles of h2o produced.
Number of molecules produced = (6.022 Ă— 10^23) x (0.875)
Number of molecules produced =5.26925 Ă—10^23 molecules.</span>
Answer:
273 K
Explanation:
The temperature of a gas at STP is 273 K. This is equal to 0°C or 32°F.