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Problems 5
0t ln the stratosphere
itadiation from the sun.
and presSsure of ozone in
Ths
absSQTt
Typieal
the Stratosi Kandl0人10 am re
spectively. How many ozone molecules are present
in ]l.OL ofair under these conditions?
Assuming that air contalns 78 percent N2, 21 pereemt
O>, and 1 percent Ar, all by volume, how many mol-
ecules of each type of gas are presentin 1.0Lotair
肚STP?
A 2.10-L vessel contains 4.65 g ofa gas at 1.00 atm
and 27.0。C. (a) Calculate the density of the gas In
grams perliter. (b) What is the molar mass of the gas。
Calculate the density of hydrogen bromide (HBr)
gas in grams per liter at 733 mmHg and 467C.
A _ certain anesthetic contains 64.9 percent Co,
13.5 percent H, and 21.6 percent QO by masS. At
1205C and 750 mmHg, 1.00 L of the gaseous com-
pound weighs 2.30 g. What is the molecular formula
9f 人he compound?
Aecompound has the empirical formula SF4. At 20.0
0.100 g of the gaseous compound oceuplesa Volume
of22.1 mL and exerts apresSure of 1.02 atm, What 1S
its molecular formula?
Dissolving 3.00 g of an impure Sample 0f calcium
carbonate in hydrochloric acid produced 0.656L 人
carbon dioxide (measured at20.0C and 792 mmHg).
Calculate the percent by mass of caleium carbonate
in the sample. State any assumptilons,
oleulafe the 和ass in orams Ofhydrogen chloride bro-
實驗式是SF6
所以M的質量會等於（SF6）*倍數