What is the density ? Mass = 120 g Volume = 96 mL

Which one of these statements would be considered a hypothesis? *

Xelga [282]

Answer:

I guess that you are going to wear blue shoes today.

Explanation:

The other ones are proven. This one is a guess, you do not know.

3 0

4 years ago

Read 2 more answers

Two solutions, initially at 24.60 °C, are mixed in a coffee cup calorimeter (Ccal = 15.5 J/°C). When a 100.0 mL volume of 0.100

-Dominant- [34]

Answer:

∆H°rxn in kJ/mol AgCl = - 59.61 kJ/mol

Explanation:

To solve this question we need to calculate the heat absorbed by the cup calorimeter and by the water in the solutions. We will also need to calculate the amount in moles produced by the reaction since we want to know the ∆H°rxn in kJ/mol AgCl .

mol AgNO₃ = 100 mL x 1L/1000 mL x 0.100 mol/L = 0.01 mol

mol NaCl = 100 mL x 1L/1000 mL x 0.200 mol/L = 0.02 mol

Therefore our limiting reagent is the 0.01 mol AgNO₃ and 0.01 mol AgCl will be produced according to the stoichiometry of the reaction:

AgNO₃ + NaCl ⇒ AgCl + NaNO₃

Heat absorbed by the water:

qw = m(H₂O) x c x ΔT where m (H₂O) = 200 g ( the density of final solution is 1 g/ml)

c = specific heat of water = 4.18 J/gºC

ΔT = change in temperature = (25.30 - 24.60 ) ºC = 0.7ºC

qw = 200 g x 4.18 J/gºC x 0.7 ºC = 585.20 J

Heat Absorbed by the calorimeter :

q cal = C cal x ΔT = 15.5 J/ºC x 0.7ºC = 10.85 J

Total Heat released by the combustion = qw + qcal = 585.20 J +10.85 J

= 596.05 J

We have to change the sign to this quantity since it is an exotermic reaction ( ΔT is positive ) and have the ∆Hrxn

∆H rxn = -596.05 J

but this is not what we are being asked since this heat was released by the formation of 0.0100 mol of AgCl so finally

∆H°rxn = -596.05 J /0.01 mol = -59,605 J/mol x 1 kJ/1000J = -59.61 kJ/mol

5 0

3 years ago

Would your results be he same if 1.5 g of barium chloride was used instead of 1.3 g? same with 0.7 g of barium chloride?

pickupchik [31]

For a chemical reaction, the results would be the same with different amounts of barium chloride present if barium chloride is not the limiting reactant of the reaction. The limiting reactant is the substance that is totally consumed when the reaction proceeds to completion. In other words, it dictates the amount of products that will be produced. Otherwise, if barium chloride is the limiting reactant, the amount of barium chloride present would definitely affect the results.

6 0

3 years ago

Why must humans find substitutes for many minerals found on Earth? (A) form at an extremely slow rate (B) controlled by other co

DochEvi [55]

The correct answer is C, too deep in the Earth to collect. Hope this helps!

3 0

3 years ago

As the temperature of a gas increases, _____. (select all the options that correctly complete the sentence.)

weeeeeb [17]

As the temperature of a gas increases, the average kinetic energy of the gas particles increases and the average speed of a gas particle increases.

According to the kinetic theory of gases, all gases are made of microscopic molecules that move in straight lines until they bump into another gas molecule or object. This transfer of energy causes molecules to move around faster and bump into each other more.

Kinetic energy is proportional to the speed of the molecules. As the speed of the colliding molecules increases, so does the total kinetic energy of all the gas molecules. It's pretty difficult to measure the speed of an individual gas molecule.

Instead, temperature can be used as a measure of the average kinetic energy of all the molecules in the gas. As the gas molecules gain energy and move faster, the temperature goes up. This is why Amy feels warmer!

To determine the average kinetic energy of gas molecules, we need to know the temperature of the gas, the universal gas constant (R), and Avogadro's number (NA).

Learn more about kinetic theory of gases here : brainly.com/question/11067389

#SPJ4

5 0

2 years ago

What is the density ? Mass = 120 g Volume = 96 mL​

What is the density ? Mass = 120 g Volume = 96 mL