1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alik [6]
3 years ago
10

A 12.5 g sample of granite initially at 82.0 oc is immersed into 25.0 g of water that is initially at 22.0 oc. what is the final

temperature of both substances when they reach thermal equilibrium? (specific heat capacity of water = 4.18 j/g.oc and specific heat capacity of granite = 0.790 j/g.oc)
Chemistry
1 answer:
Paraphin [41]3 years ago
7 0

The amount of heat lost by granite is equal to the amount of heat gained by water. Therefore their change in enthalpies must be equal. The opposite in sign means that one is gaining while the other is losing

ΔH granite = - ΔH water

ΔH is the change in enthalpy experienced by a closed object as it undergoes change in energy. This is expressed mathematically as,

ΔH = m Cp (T2 – T1)

Given this information, we can say that:

12.5 g * 0.790 J / g ˚C * (T2 – 82 ˚C) = - 25.0 g * 4.18 J / g ˚C * (T2 – 22 ˚C)

9.875 (T2 – 82) = 104.5 (22 – T2)

9.875 T2 – 809.75 = 2299 – 104.5 T2

114.375 T2 = 3108.75

T2 = 27.18 ˚C

The temperature of 2 objects after reaching thermal equilibrium is 27.18 ˚<span>C.</span>

You might be interested in
How are individual atoms of oxygen formed in the stratosphere?
zimovet [89]
Individuals of oxygen are formed in the stratosphere when oxygen molecules that consist of two oxygen atoms are striked by ultraviolet light. This causes the atoms to split. 
6 0
3 years ago
Read 2 more answers
What is the concentration of bromide, in ppm, if 12.41 g MgBr2 is dissolved in 2.55 L water.
pav-90 [236]

Answer:

concentration of bromide (Br⁻) = 4234 mg/L = 4234 ppm

Explanation:

ppm (parts per million) concentration is defined as the mass (in milligrams) of a substance dissolved in one liter of solution.

In our case we have:

mass of MgBr₂ = 12.41 g

volume of water (which is equal to the final solution volume) = 2.55 L

Now we devise the following reasoning:

if         12.41 g of MgBr₂ are dissolved in 2.55 L of water

then         X g of MgBr₂ are dissolved in 1 L of water

X = (1 × 12.41) / 2.55 = 4.867 g of MgBr₂

if in         184 g (1 mole) of MgBr₂ we have 160 g of Br⁻

then in   4.867 g of MgBr₂ we have Y g of Br⁻

Y = (4.867 × 160) / 184 = 4.232 g of bromide (Br⁻)

4.232 g of bromide (Br⁻) = 4234 mg of bromide (Br⁻)

concentration of bromide (Br⁻) = 4234 mg/L = 4234 ppm

7 0
3 years ago
Some chemical factories make hydrogen gas (H2) using a process called steam methane reforming. In this process, methane (CH4) co
erica [24]

Answer:

steam and methane

Explanation:

5 0
2 years ago
Which reactions are exothermic?
poizon [28]

Answer:

Explanation:

exothermic reactions are the reactions which involve the release of energy.

the energy released can be of any forms ,for example heat,light .

all the combustion reactions are exothermic reactions

4 0
3 years ago
In two or more complete sentences explain how to balance the chemical equation and classify its reaction type.
Artemon [7]
<h3>Answer:</h3>

#1. Balanced equation: 2C₅H₅ + Fe → Fe(C₅H₅)₂

#2. Type of reaction: Synthesis reaction

<h3>Explanation:</h3>
  • Balanced equations are equations that obey the law of conservation of mass.
  • When an equation is balanced the number of atoms of each element is equal on both side of the equation.
  • Equations are balanced by putting appropriate coefficients on the reactants and products.
  • In our case, we are going to put coefficients 2, 1 and 1.
  • Thus, the balanced equation will be;

2C₅H₅ + Fe → Fe(C₅H₅)₂

  • This type of a reaction is known as synthesis reaction, in which two or more reactants or compounds combine to form a single compound or product.
8 0
3 years ago
Other questions:
  • Which statement is TRUE about polar covalent bond?
    14·1 answer
  • In the following reaction, which species is reduced? 2k+br2 yield 2k+ + 2br-
    12·1 answer
  • Which properties are characteristic of metalloids
    5·2 answers
  • 1.00 M aqueous solution of NaOH, a 0.50 M aqueous solution of H2SO4 and a coffee cup calorimeter were allowed to stand at a room
    13·2 answers
  • Using the law of conservation of energy, explain why an LED light is more energy efficient that an incandescent light bulb.
    11·1 answer
  • A group of students want to see how temperature affects the time spilled water to dry up what will be independent and dependent
    12·1 answer
  • Four gases were combined in a gas cylinder with these partial pressures: 3.5 atm N2, 2.8 atm O2, 0.25 atm Ar, and 0.15 atm He. W
    10·1 answer
  • Help me with this question please.​
    9·1 answer
  • Helppppppppppppppppp
    5·1 answer
  • How many moles are in 11.5 L of a gas at STP?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!