I need these answered please 21102 (I) 2110 (g) + 0(g) Decompose L.lgofo, ina fl

Question

I need these answered please

21102 (I) 2110 (g) + 0(g) Decompose L.lgofo, ina flask with a volume of 2.50 L What is the volume of o, at STP A 50 L cylinder contains oxygen gas at 20.0°C and 735 mm Hg. How many grams of oxygen are in the cylinder? A sample of helium gas has a volume of 0.180L., a pressure of 0.800 atm and a temperature of 29°C What is the new temperature ('C) of the gas at a volume of 900 mL and a pressure of 3.20 atm? The % of gases in air Partial pressure (STP) %N? 593.4 mm He %02? 96 Ar? 96 CO ? 159.2mmHg 7.1 mmHg 02 mm Hg 211,02(1) 211,0 (g) + 01 (g) Decompose 1.l gof H O, in a flask with a volume of 2.50 L. What is the volume of o, at STP The pressure of sulfur dioxide in a container is 159 kPa. What is this pressure in atmospheres (1 atm 101.325 Pa = 760 torr)? The air pressure in a volleyball is 75 psi. what is this pressure in torr (1 ps: 14.7 atm. I am = 101325 Pa = 760 torr?

Explanation / Answer

2H2O2 + --> 2H2O + O2

V = 2.5 L

m = 1.1 g of H2O2

STP of O2

find moles of H2O2

mol = mass/MW = 1.1/34 = 0.03235 mol of H2O2

then we produce 2:1, 0.03235 /2 = 0.016175 mol of O2

STP = 1 mol -> 22.4 L

0.016175 mol --> 22.4*0.016175 = 0.36232 L

2)

V = 5 L

T = 20 °C = 293

P = 735 mmhg = 735/760 = 0.967 atm

find grams of O2

PV = nRT

n = PV/(RT) = 0.967*5/(0.082*293) = 0.20124 mol of O2

mass= mol*MW = 0.20124*32 = 6.4396 g of O2

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