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1. ### A balloon contains 2.0 L of helium gas at STP . How many moles of helium are present?

1 mol He gas at STP has volume 22.4 L If volume is 2.0 L , Mol He = 2 L / 22.4 L/mol = 0.089 mol

1 Answers · Science & Mathematics · 21/07/2020

2. ### A sample of nitrogen gas has a volume of 1.00 L at STP . What is the temperature in degrees c if the volume is 10.0 L at 2.00 atm/.?

another approach is to use the combined gas law P1V1/T1 = P2V2/T2 P1 is 1 atm, V1 is 1.00 L, T1 is 273 K, P2 is 2.00 atm, V2 is 10.0 L, solve for T2 in...

2 Answers · Science & Mathematics · 14/08/2020

... constant = 6.02 × 10²³ /mol Molar volume of a gas at STP = 22.4 L (6.85 × 10²² SO₂ molecules) × (1 mol...

3 Answers · Science & Mathematics · 16/07/2020

*** (a) *** how much would it "weigh"... that's not as easy as it sounds. perhaps you meant to write.. "what is the mass of the gas?" but you asked for weight so. here we go First, let's assume your "oxygen" is O2.. molecular oxygen gas...

2 Answers · Science & Mathematics · 16/07/2020

a) (7.56 g Br2) / (159.808 g Br2/mol) × (6.022 × 10^23 molecules/mol) = 2.85 × 10^22 molecules Br2 b) (88.55 g CO) / (28.0101 g CO/mol) × (6.022 × 10^23 molecules/mol) = 1.904 × 10^24 molecules CO c) (18.6 L) / (22.71 L...

2 Answers · Science & Mathematics · 16/07/2020

6. ### chem help?

(36.0 L) x (101.325 kPa / 112 kPa) x (273 K) / (27 + 273) K = 29.6 L

1 Answers · Science & Mathematics · 28/05/2020

7. ### Need a quick help for 2 of my stoichiometry practice question!?

2 FeBr3 + 3 H2SO4 → Fe2(SO4)3 + 6 HBr Supposing you meant "produced from 22.5 g of iron (Ill) bromide": (22.5 g FeBr3) / (295.557 g FeBr3/mol) x (1 mol Fe2(SO4)3 / 2 mol FeBr3) x (399...

1 Answers · Science & Mathematics · 07/06/2020

8. ### Chem Multiple Choice help.?

101.1 kPa - 2.200 kPa = 98.9 kPa So answer a) Absolute zero: b) A substance has no molecular motion density: b) Decreases b) i) and iii) (0.707 g/L) x (22.4 L/mol) = 15.8 g/mol The gas with a molar mass like that is CH4...

1 Answers · Science & Mathematics · 15/05/2020