Atoms and Molecules
Stoichiometry
Thermo
Gas Laws
100

Name the acid: HBrO2

Bromous acid

100

A car is made up of 1 steering wheel, 4 wheels, 1 battery, and 5 seats. If a factory has 10,000 car seats, 20,000 wheels, 6000 batteries, and 2000 steering wheels, how many cars can be made? 

2000

100

When something hot is added to something cold, why do we set -q = q? What law allow us to do this? 

Law of conversation of energy

First law of thermodynamics

qrxn + qsoln = 0

100

How many moles of H2 are in a 71.95 L container at 177 kPa and 537.4 K?

2.85 mol

200

Mg(OH)2 is a: weak, non, or strong electrolyte

Weak 

200

Remember the poor tarantula from week 1? The one that got stung by a parasitic wasp? It's still alive but paralyzed, and the wasp larvae has hatched and is ready to emerge. If the larvae drinks 300 microliters of the spider's blood 5 times a day, how many weeks does it take for the larvae to completely drain a spider with 50 mL of blood? 

4.8 weeks! 

So in our 5 week summer session the larvae has eaten the spider from the inside out :'( 


200

2 P + 3 Cl2 → 2 PCl3 + 576 kJ

If 135.9 grams of PCl3 are produced, how many kJ of heat will be absorbed or released?

-285 KJ

200

A sample of Cl2 experiences a change in volume from 13.6 L to 58.59 L. If its new pressure is 4.862 atm, what was its original pressure in atmospheres?

20.9 atm

300

What is the oxidation number of sulfur in ammonium sulfate? 

+6

300

How many mL of 1.50 M nitric acid is required to react with 100.0 g copper (I) oxide? 

14 HNO3 + 3 Cu2O --> 6 Cu(NO3)2 + 2 NO + 7 H2O

2170 mL

300

Given values:
Substance: selenium (Se)
heat transferred (q): 25346 J absorbed
specific heat capacity (c): 0.3224 J/(g·K)
amount (m): 218.4 g

Wanted:
temperature change (ΔT) in kelvins (K)?

360 K

300

The temperature of a sample of BF3 is changed, causing a change in volume from 2482.3 mL to 5590 mL. If the starting temperature was 975.17 K, what is the final temperature in kelvins?

2200 K

400

Given:
• 6.78% beryllium
• 21.06% nitrogen
• 72.16% oxygen
What is the empirical formula?

BeN2O6

400

How much (in L) 0.20 M phosphoric acid is needed to react with 100 mL of 0.10 M sodium hydroxide? 

0.017 L

400

Given values:
Liquid: water (H2O)
specific heat capacity of liquid (c1): 4.184 J/(g·K)
amount of liquid (m1): 889.2 g
initial temperature of liquid (T1): 319.7 K

Solid object placed in liquid: unknown
amount of solid (m2): 131.9 g
initial temperature of solid (T2): 2963.4 K
final temperature of system (Tf): 332.2 K

Wanted:
specific heat capacity of solid (c2) in joules per gram kelvin (J/(g·K))?

0.134 J/(g.K)

400

What mass of H2 is required to react with O2 to produce 912 mL of H2O (g) at 112 °C and 0.989 atm?

2 H2 (g) + O2 (g) --> 2 H2O (g)

0.057 g H2

500

Given: 484 g NO2
Wanted: liters at STP?

236 L

500

HCl + LiOH → LiCl + H2O

48.17 grams of LiOH are reacted with 485.21 grams of HCl, how many grams of LiCl will be produced?

85.27 g LiCl

500

50.0 g iron at 225oC is brought into contact with 50.0 g gold at 25.0oC. Assuming no heat is lost, what is the final temperature of both metals?

Specific heat: iron = 0.449 J/goC, gold = 0.128 J/goC


181oC

500

N2 + O2 → N2O4

23.9 liters of N2 are reacted with 230 grams of O2, 55.8 grams of N2O4 are produced at STP. What is the percent yield of this reaction?

56.8%