Mass is measured in_______ or kilograms.

Chemistry

2 answers:

Dafna1 [17]3 years ago

7 0

Answer:

the answer for another measurement of mass is grams

Licemer1 [7]3 years ago

5 0

Grams hope it helps you

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A student dissolves 15.0 g of ammonium chloride(NH4Cl) in 250. 0 g of water in a well-insulated open cup. She then observes the

iren2701 [21]

Answer:

1) Endothermic.

2) $Q_{rxn}=4435.04J$

3) $\Delta _rH=15.8kJ/mol$

Explanation:

Hello there!

1) In this case, for these calorimetry problems, we can realize that since the temperature decreases the reaction is endothermic because it is absorbing heat from the solution, that is why the temperature goes from 22.00 °C to 16.0°C.

2) Now, for the total heat released by the reaction, we first need to assume that all of it is released by the solution since it is possible to assume that the calorimeter is perfectly isolated. In such a way, it is also valid to assume that the specific heat of the solution is 4.184 J/(g°C) as it is mostly water, therefore, the heat released by the reaction is:

$Q_{rxn}=-(15.0g+250.0g)*4.184\frac{J}{g\°C}(16.0-20.0)\°C\\\\ Q_{rxn}=4435.04J$

3) Finally, since the enthalpy of reaction is calculated by dividing the heat released by the reaction over the moles of the solute, in this case NH4Cl, we proceed as follows:

$\Delta _rH=\frac{ Q_{rxn}}{n}\\\\\Delta _rH= \frac{ 4435.04J}{15.0g*\frac{1mol}{53.49g} } *\frac{1kJ}{1000J} \\\\\Delta _rH=15.8kJ/mol$

Best regards!

4 0

3 years ago

Describe the appearance of the compound fes

pishuonlain [190]

FeS known as iron sulphide is formed by the following reaction:
Fe + S ................> FeS

Iron sulphide has a molar mass of 87.910 grams. It has a grey color and can either be in the form of a powder of in the form of lumps.
It is insoluble in water and it reacts with acids.
Its density is 4.84 g/cm^3 and it has a melting point of 1194 degrees celcius.

4 0

3 years ago

Which of the following statements is/are true? Select all that apply. a. The entropy of the starting materials for a reaction is

seraphim [82]

Answer:

The entropy of the products of a reaction is always greater than the entropy of the starting materials

Explanation:

The second Law of Thermodynamics says that entropy always increases

A + B ----> AB

A and B that were completely arranged in their structures had to be completely messy to form compound AB

When an isolated system reaches a maximum entropy configuration, it can no longer undergo changes: it has reached equilibrium.

6 0

3 years ago

What is the energy of a 4.66 x 1014 Hz wave?

docker41 [41]

I attached the working and the answer to both questions below.

Please note that E = energy, ν = frequency, h = Plank's Constant

The energy of a 4.66 x 10¹⁴ Hz wave is 3.088 × 10⁻¹⁷ J