00:01
Okay, so in this question we're given, i'm looking at the decay of radium 226 into...
00:10
And we are given that there is one gram of it, and we want the activity of this one gram sample.
00:20
An activity we want it to be in terms of curie.
00:23
And one query is actually equivalent to 3 .7 times 10, the power of 10, back close.
00:32
Alright, first of all we need to find how many nuclei there are in one gram of this sample.
00:43
So for that we will need the molar mass of radium.
00:52
And the molar mass is given by 2 to 6 .0254 grams per mole.
01:03
And given our mass, which is 1 gram, we divide it by the molar mass and then we multiply by arbogadro's number to get the exact amount of nuclei there are right avagagagros number is 6 .022 times 10 to power 23 thus total number of nuclei that we get is actually 2 .6643 10 to power 21 nuclei next we will need the half -life of radium 226 can get that from searching online and that is the about 1 ,600 years but since we need to convert to curie and we need it to be in backrose first and backroads we're dealing with per second right the backero unit is in terms of per second.
02:20
So we have to convert our t half, our half life into seconds.
02:26
And that should be quite simple...