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erica [24]
3 years ago
11

How many joules of energy are needed to change the temperature of 75.0 g of water 250C?

Chemistry
1 answer:
Phoenix [80]3 years ago
7 0
Answer:

17000 joules

Explanation:

With knowledge of the specific heat capacity of a substance, its mass, and the temperature change, we can convert this to the energy required for this temperature change using:

<span>ΔH=mCΔT</span>, where

<span>ΔH=</span>change in enthalpy (J)

<span>m=</span> mass of substance being heated (g) i.e. water in this question

<span>C=</span> specific heat capacity (J/g°C)

<span>ΔT=</span> change in temperature (°C)

We know mass<span>=65g</span> and <span>ΔT=76°C−12°C=64°C</span>

The specific heat capacity of water is 4.18J/g°C

Therefore, <span>ΔH=65g⋅<span><span>4.18J</span><span>g°C</span></span>⋅64<span>°C</span></span>

<span>=17388.8J</span>

<span>=17000J</span> (2 significant figures)

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Answer:

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Explanation:

6 0
2 years ago
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How many grams of oxygen are produced when 7.65 moles of water is decomposed
maksim [4K]

Answer:

The answer to your question is 122.4 g of O₂

Explanation:

Data

mass of O₂ = ?

moles of H₂O = 7.65

Process

1.- Write the balanced chemical reaction

                   2H₂O  ⇒  2H₂  +  O₂

2.- Convert the moles of H₂O to grams

molar mass of H₂O = 2 + 16 = 18 g

                    18 g of H₂O ---------------- 1 mol

                      x                ----------------- 7.65 moles

                      x = (7.65 x 18) / 1

                      x = 137.7 g H₂O

3.- Calculate the grams of O₂

                 36 g of H₂O -------------------- 32 g of O₂

              137.7 g of H₂O -------------------  x

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6 0
3 years ago
0.785 moles of N2,fill a balloon at 1.5 atm and 301 K.<br> What is the volume of the balloon?
Tcecarenko [31]

Answer:

V = 12.93 L

Explanation:

Given data:

Number of moles = 0.785 mol

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Temperature = 301 K

Volume of balloon = ?

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The given problem will be solve by using general gas equation,

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V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will put the values.

V = nRT/P

V = 0.785 mol × 0.0821 atm.L/ mol.K × 301 K / 1.5 atm

V = 19.4 L /1.5

V = 12.93 L

7 0
3 years ago
A compound consisting of B, N, and H undergoes elemental analysis. The % composition by mass is found to be 40.28% B, 52.20% N,
swat32

Empirical formula is the simplest ratio of components making up a compound.

The percentage composition of each element has been given

therefore the mass present of each element in 100 g of compound is

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number of moles  

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