Chemistry, 10.07.2019 07:30 katiems5514

Akettle of water is at 14.5°c. its temperature is then raised to 50.0°c by supplying it with 5,680 joules of heat. the specific heat capacity of water is 4.186 joules/gram degree celsius. what is the mass of water in the kettle? express your answer to three significant figures. the mass of the water in the kettle is grams.

Answers: 1

Show answers

Answers

Answer from: sloane50

- 38.2 g.

Solution:- The equation used for solving this type of calorimetry problems is:

$q=mc\Delta T$

where, q is the heat energy, m is mass, c is specific heat and delta T is the change in temperature.

Water temperature is increasing from 14.5 degree C to 50.0 degree C.

$\Delta T=50.0-14.5$ = 35.5 degree C

q is given as 5680 J and specific heat value is $4.186\frac{J}{g.^0C}$ .

The equation could be rearranged for m as:

$m=\frac{q}{c*\Delta T}$

Let's plug in the values in it:

$m=\frac{5680}{4.186*35.5}$

m = 38.2 g

So, the mass of water in the kettle is 38.2 g.

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

Answer from: Quest

the dissolution of polymer can be thermodynamically described in 2 steps.

Another question on Chemistry

Chemistry, 22.06.2019 06:00

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

Answers: 2

Answer

Chemistry, 22.06.2019 09:20

Explain that newton first law,second law and third law of motion?

Answers: 2

Answer

Chemistry, 22.06.2019 18:30

When a device is used in a circuit in which the voltage is 81 v the current flowing through the device is 3 a what is the resistance of the device

Answers: 2

Answer

Chemistry, 22.06.2019 21:00

Use the measurements in the table to determine which unidentified metal has the highest density. metal volume mass a 10.5 cm3 122 g b 14.2 cm3 132 g c 16.1 cm3 115 g d 12.7 cm3 126 g

Answers: 2

Answer

You know the right answer?

Akettle of water is at 14.5°c. its temperature is then raised to 50.0°c by supplying it with 5,680 j...

Questions