Moles
There are __________ particles in one mole of substance. (Avogadro's #)
What is 6.022x10^(23).
A cloud weights 3.60 g and has a volume of 1.45x10^(5)mL. It has a density of ________.
What is 2.48x10^(-5) g/mL.
CH4(g)+2O2(g)⟶CO2(g)+2H2O(g)
This reaction is an example of a _________ reaction.
What is a combustion reaction.
Commercially available hot packs are simple in design: a pouch with water on one side, isolated by a barrier from a specific salt on the other side. When the barrier is broken, the salt and water mix, and the solution becomes hot. This is an example of _________ reaction.
Convert 912 mmHg912 mmHg to atmospheres.
What is 1.20 atm.
There are ______ moles in 2.13 g of carbon.
What is 0.177 moles.
A block of lead has a density of 5.65 g/cubic centimeter and a volume of 0.126 L. This block has a mass of ________ (g)
What is 712 g.
A 14.561 g sample of CaCl2 was added to 12.402 g of K2CO3 and mixed in water. A 3.584 g yield of CaCO3 was obtained. What is the limiting reagent?
What is K2CO3.
When 1.490×10^3 J of heat energy is added to 41.9 g of ethanol, C2H6O, the temperature increases by 14.5 ∘C. Calculate the molar heat capacity of C2H6O.
What is 113J/(mol⋅∘C).
If an ideal gas has a pressure of 9.39 atm,9.39 atm, a temperature of 473 K,473 K, and a volume of 98.75 L,98.75 L, how many moles of gas are in the sample?
What is 23.9 mol.
There is a chunk of graphite(C) that weighs 5.67x10^(10) nanograms. There are _______ moles of Carbon in that chunk of graphite.
What is 4.72 moles.
A soda has a a density of 4.71 g/cubic centimeter and a mass of 1.84x10^(8)micrograms. The soda has a volume of ________(mL).
What is 39.1 mL.
A 14.561 g sample of CaCl2 was added to 12.402 g of K2CO3 and mixed in water. A 3.584 g yield of CaCO3 was obtained. What is the percent yield of CaCO3?
What is 39.90g.
Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 9.80 MJ of energy in the form of heat if the temperature of the sodium is not to increase by more than 10.0 °C? Use 𝐶P=30.8 J/(K⋅mol) for Na(l) at 500 K.
What is 7.32 *10^5g.
Solid ammonium chloride, NH4Cl, is formed by the reaction of gaseous ammonia, NH3, and hydrogen chloride, HCl. NH3(g)+HCl(g)⟶NH4Cl(s)
A 5.87 g sample of NH3 gas and a 5.87 g sample of HCl gas are mixed in a 2.00 L flask at 25 ∘C. Identify the limiting reagent.
What is HCl.
The volume of a piece of Copper is 5.28 mL. It has a density of 2.79 g/cubic centimeter. There are ___________ moles of copper present.
What is 0.232 moles.
After adding a baby into a tub that contained 12.0 L of water, the water now measures 14.6 L. The baby weighs 6.51 Kg. The density of the baby is _______ (g/mL).
What is 2.50g/mL.
If a solution containing 54.21 g of lead(II) perchlorate is allowed to react completely with a solution containing 8.564 g of sodium sulfide, how many grams of solid precipitate will be formed?
What is 26.65g.
A coffee cup calorimeter contains 154.70 g of water at 22.50 °C. A 65.790 g piece of iron is heated to 101.78 °C. The piece of iron is added to the coffee cup caloriemter and the contents reach thermal equilibrium at 25.68 °C. The specific heat capacity of iron is 0.449 Jg·K and the specific heat capacity of water is 4.184 Jg·K. How much heat is lost by iron?
What is 2186J.
Solid ammonium chloride, NH4Cl, is formed by the reaction of gaseous ammonia, NH3, and hydrogen chloride, HCl.NH3(g)+HCl(g)⟶NH4Cl(s)
A 5.87 g sample of NH3 gas and a 5.87 g sample of HCl gas are mixed in a 2.00 L flask at 25 ∘C. How many moles of NH3 remaining?
What is 0.184 mol.
A 5.40 g mixture contains both lithium fluoride,LiF, and potassium fluoride, KF. If the mixture contains 3.26 g fluorine, what is the mass of the KF in the mixture?
What is 1.73g.
A sample in a weigh boat is weighed as 10.5 g. The weigh boat has a mass of 5.60 g. The sample is added to a beaker containing 0.021 L of water and it now reads 0.034 L. The sample has a density of ______ (g/mL).
What is 0.38 g/mL.
If a solution containing 54.21 g of lead(II) perchlorate is allowed to react completely with a solution containing 8.564 g of sodium sulfide, how many grams of the reactant in excess will remain after the reaction?
What is 9.66g Pb(ClO4)2.
A coffee cup calorimeter contains 154.70 g of water at 22.50 °C. A 65.790 g piece of iron is heated to 101.78 °C. The piece of iron is added to the coffee cup caloriemter and the contents reach thermal equilibrium at 25.68 °C. The specific heat capacity of iron is 0.449 Jg·K and the specific heat capacity of water is 4.184 Jg·K. What is the final temp?
What is 299.00K.
What is the pressure in atmospheres of the gas remaining in the flask? Ignore the volume of solid NH4ClNH4Cl produced by the reaction.
What is 2.25 atm.