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Hello.
00:01
So here in this question it is given that phosphorus is combining with oxygen to form p4 -o -10.
00:07
We have the mass of oxygen given as 6 .46 grams.
00:11
So what we need to calculate here is for the mass of phosphorus required.
00:16
Okay.
00:17
So let's see the answer for this question.
00:19
First of all, let us balance this equation.
00:21
So we will get four phosphorus plus five oxygen giving p4 o -10.
00:26
Okay.
00:27
So from this equation we can see that 4 moles of phosphorus is combining with 5 moles of oxygen.
00:38
Okay? so we have the mass of oxygen given here.
00:43
We can calculate for the number of moles.
00:46
So number of moles is equal to mass divided by molar mass.
00:52
Okay.
00:53
So we can substitute the values over here.
00:55
We have the mass as 6 .46 divided by the molar masses.
01:00
So that is equal to 0 .2018 moles.
01:08
So if we are having 0 .2018 moles of oxygen, then we can calculate for the number of moles of phosphorus...