Answer:
Explanation:
No worries, I got you :)
So for the first question, you need to use PV=nRT to find the n, or in other words, the number of moles. Then, you can find the molar mass since you know the grams and the moles
110 kPa / 101.3 = 1.085 atm (I converted it to atm so I can use the .08206 L atm/ k mol for the rate)
550 ml / 1000 = .550 L (I converted mL to L in order to use the .08206 L atm/ k mol for the Rate)
28.5 c + 273 = 301.5 K (I converted C to K in order to use the .08206 L atm/ k mol for the Rate)
PV=nRT
(1.085) (.550 L) = n (0.08206) (301.5)
Divide the (0.08206) (301.5) to get n alone:
(1.085) (.550 L) / (0.08206) (301.5) = n
When I divided, I got n= .02412 moles, and since we have 1.88g , we divide the 1.88 by .02412 to get the molar mass (grams/mole)
77.94 g/mole is the molar mass
we know that there are 3 H's in the compound, so we do 3(1.008) and subtract 77.94 by what you get.
3 x 1.008 = 3.024 -----> 77.94-3.024 = 74.9
Now we look at the periodic table and try to find an element that has a molar mass of 74.9
Arsenic (As) has a molar mass of 74.922, which is close enough. Plus, Arsenic has a charge of 3, so it fits with the 3 hydrogens.
