All categories

3 years ago

How much energy is required to change the temperature of 35.0 g of Lead

Chemistry

1 answer:

Nezavi [6.7K]3 years ago

7 0

Answer:

Q = 270 Joules (2 sig. figs. as based on temperature change.)

Explanation:

Heat Transfer Equation of pure condensed phase substance => Q = mcΔT

Mixed phase (s ⇄ l melting/freezing, or l ⇄ g boiling/condensation) heat transfer equation => Q = m∙ΔHₓ; ΔHₓ = phase transition constant

Since this is a pure condensed phase (or, single phase) form of lead (Pb°(s)) and not melting/freezing or boiling/condensation, one should use

Q = m·c·ΔT

m = mass of lead = 35.0g

c = specific heat of lead = 0.16J/g°C

ΔT = Temp change = 74°C - 25°C = 49°C

Q = (35.0g)(0.16J/g·°C )(49°C) = 274.4 Joules ≅ 270 Joules (2 sig. figs. as based on temperature change.)

You might be interested in

A 367.8 g sample of potassium chlorate was decomposed according to the following equation:

Pie

The answer is A i did this before hope this helps

7 0

3 years ago

Ill give the brainliest answer to whoever helps me with this equation

vampirchik [111]

Answer: The percent yield for the $NaBr$ is, 86.7 %

Explanation : Given,

Moles of $FeBr_3$ = 2.36 mol

Moles of $NaBr$ = 6.14 mol

First we have to calculate the moles of $NaBr$

The balanced chemical equation is:

$2FeBr_3+3Na_2S\rightarrow Fe_2S_3+6NaBr$

From the reaction, we conclude that

As, 2 moles of $FeBr_3$ react to give 6 moles of $NaBr$

So, 2.36 moles of $FeBr_3$ react to give $\frac{6}{2}\times 2.36=7.08$ mole of $NaBr$

Now we have to calculate the percent yield for the $NaBr$ .

$\text{Percent yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100$

Experimental yield = 6.14 moles

Theoretical yield = 7.08 moles

Now put all the given values in this formula, we get:

$\text{Percent yield}=\frac{6.14mol}{7.08mol}\times 100=86.7\%$

Therefore, the percent yield for the $NaBr$ is, 86.7 %

6 0

2 years ago

Ethyl acetate can be prepared by an SN2 reaction. Draw the alkylbromide and nucleophile used in the reaction. Remember to includ

bulgar [2K]

Answer:

Few important points related to $S_N2$ reaction:

1. $S_N2$ is a one-step reaction that follows second order kinetics.

2. In $S_N2$ reaction, a transition state is formed in situ.

3. Strong nucleophiles like $OH^- \ or\ CN^-$ are used in case of bi-molecular nucleophilic substitution reaction.

Ethyl acetate can be prepared by a second-order nucleophilic substitution reaction between acetic acid and ethyl bromide.

The reaction between acetic acid and ethyl bromide is drawn below:

8 0

2 years ago

Read 2 more answers

What has affected the honeybee population

I am Lyosha [343]

Colonial collapse disorder

4 0

2 years ago

A car is traveling with velocity of 40 m/s and has a mass of 1120 kg. The car has __________ energy.

Nata [24]

Answer:

Explanation:

The car has kinetic energy.

6 0

3 years ago