Easy
Stoich
Stoich
How many molecules are in 2 moles?
1.204x10^24 molecules
What are the rules for adding/subtracting with sig figs?
What are the rules for multiplying/dividing with sig figs?
Adding and sub lowest # decimal point
Mult dividing least # of sig figs
Convert the number from K to C: 250 K
-23.15 C
write the balanced equation for Sodium sulfide reacting with magnesium iodide to produce sodium iodide and magnesium sulfide
Na2S + MgI2 = 2NaI + MgS
How many moles of gas occupy 98 L at a pressure of 2.8 atmospheres and a temperature of 292 K?
11 moles of gas
Balance the equation
_____K + ___ B2O3 --> ___ K2O + ___ B
6,1,3,2
CFU: why do i need to balance my equation for in stoich
How many sig figs are in 0.6078?
4
what rules were used?
How many hydrogen atoms are present in 4.0 mol Ca(OH)2?
Calculate your answer to the correct number of significant figures and
enter your answer using scientific notation format.
4.8 x10^24 hydrogen atoms
Write the balanced chemical equation of the reaction : when potassium chlorate is heated, it decomposes to form KCl and oxygen gas.
2 KClO3 --> 2 KCl + 3 O2
A 35 L tank of oxygen is at 315 K with an internal pressure of 190 atmospheres. How many moles of gas does the tank contain?
260 moles of gas
How many moles are in 1.5 X 10 ^ 20 molecules?
0.00025 moles
Write 600 in scientific notation
6.0x10^2
CFU: difference between 10^2 vs 10^-2
2.347 atm to torr
1784 torr
From the reaction : B2H6 + O2 --> HBO2 + H20
a) what mass of O2 will be needed to burn 36.1 g of B2H6?
125g O2
A sample of oxygen gas occupies a volume of 250. mL at a pressure of 740. torr. What volume will the gas occupy at a pressure of 800. torr if temperature is held constant? I want my answer in mL
231 mL
What is the mass of 5 moles Fe2O3?
800 g Fe2O3
What is the sum of 0.98 + 0.970, with correct sig figs?
1.95
CFU: how many decimal places should be there?
456 torr to mmhg
456 mmhg
From the reaction : B2H6 + O2 --> HBO2 + H20
b) How many moles of water are produced from 19.2 g of B2H6?
1.39 moles of H2O
A sample of helium occupies a volume of 3.8 L at -45 degrees Celsius. What volume will it occupy at 45 degrees Celsius?
5.3L
How many atoms are in 0.138g of NaCL?
2.84 x10^21 atoms of NaCl
3340 ft x 1.2 ft = ? with correct sig figs
4.0 x 10^3
If the Kelvin temperature of gas is tripled at constant volume and moles,
the pressure:
increased by a factor of three
2 HCl + Zn --> ZnCl2 + H2
When you use 25 mL of 4.0 M HCl to produce H2 gas, how many grams of Zinc foes it react with?
3.3g of Zinc
A soda bottle is flexible enough that the volume of the bottle can change when without opening it. If you have an empty soda bottle with a volume of 2.0 L at room temperature (25 degrees Celsius), what volume will the bottle occupy when in the freezer at a temperature of -4.0 degrees Celsius?
1.8 L