The area of a rectangle with sides measuring 1 × 10ª cm and 5 x 10-1 cm

If 1.9 kJ of heat is transferred to 96 g aluminum at 113°C, what would the

erastova [34]

Answer:

T2 = 135.1°C

Explanation:

Given data:

Mass of water = 96 g

Initial temperature = 113°C

Final temperature = ?

Amount of energy transfer = 1.9 Kj (1.9×1000 = 1900 j)

Specific heat capacity of aluminium = 0.897 j/g.°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = T2 - T1

Now we will put the values in formula.

Q = m.c. ΔT

1900 j = 96 g × 0.897 j/g.°C × T2 - 113°C

1900 j = 86.112 j/°C × T2 - 113°C

1900 j / 86.112 j/°C = T2 - 113°C

22.1°C + 113°C = T2

T2 = 135.1°C

4 0

3 years ago

Both the acetamido (-NHCOCH3) and bromo (-Br) substituents are ortho, para directors. Even though the acetamido group is much la

sweet [91]

Answer:

Explanation has been given below

Explanation:

Attachment of -Cl group at ortho position to acetamido group can be explained in terms of hydrogen bonding formation.
A hydrogen bonding can be formed between proton attached with N atom in acetamido group and Cl atom at ortho position. This leads to a formation of a stable 5-membered ring structure.
Hence ortho substitution by Cl is favorable process.
There is no hydrogen bonding possible between Br and Cl atom in ortho position. Therefore Cl prefers para position to avoid steric hindrance.
Structure of hydrogen bonded structure has been shown below.

8 0

3 years ago

For the reaction of C 2H 4( g) with O 2( g), to form CO 2( g) and H 2O( g), what number of grams of CO 2 could be produced from

maksim [4K]

Answer:

4.58g of CO₂ could be produced

Explanation:

Based on the reaction:

C₂H₄(g) + 3O₂(g) → 2CO₂(g) + 2H₂O(g)

<em>1 mole of C₂H₄ reacts with 3 moles of oxygen to produce 2 moles of CO₂</em>

<em />

To solve this question we must find the moles of each reactant in order to find limiting reactant. With limiting reactant we can find the moles -And the mass- of CO₂ produced:

<em>Moles C₂H₄ -Molar mass: 28.05g/mol-</em>

2.0g * (1mol / 28.05g) = 0.0713moles

<em>Moles O₂ -Molar mass: 32g/mol-</em>

5.0g * (1mol / 32g) = 0.156moles

For a complete reaction of 0.0713 moles of C2H4 are required:

0.0713 moles C₂H₄ * (3 moles O₂ / 1 mol C₂H₄) = 0.214 moles of O₂

As there are just 0.156 moles, O₂ is limiting reactant.

The moles of CO₂ produced are:

0.156 moles O₂ * (2mol CO₂ / 3mol O₂) = 0.104 moles CO₂

The mass is -Molar mass CO₂: 44.01g/mol-

0.104 moles CO₂ * (44.01g / mol) =

<h3>4.58g of CO₂ could be produced</h3>

4 0

2 years ago

Consider the following molecular shapes. (b) Which has the most unshared pairs around the central atom?

Olin [163]

The molecular shapes which have the most electron pairs (both shared and unshared) around the central atom are linear-shaped.

<h3>What are molecular shapes?</h3>

The molecular shapes are the shapes like linear, trigon planner, octahedral, tetrahedral, etc. which depend on the number of atoms and the lone pair and bond pair of atoms.

In linear shape, a maximum number of electrons take part in the hybridization and can also have lone pairs to give repulsion to the bond pairs of the atoms and only 2 electrons take part in bond formation.

Therefore, linear-shaped are the molecular shapes that have the most electron pairs (both shared and unshared) around the central atom.

Learn more about molecular shapes, here:

brainly.com/question/22697472

#SPJ4

5 0

1 year ago

Does the application of heat to a substance always produce a chemical change?

tatiyna

Answer;

No, sometimes it just causes a physical change, such as ice melting to water.

Explanation;

-The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.

Heating a substance may cause a physical change or a chemical change. For example melting ice to water, involves supplying heat to change ice into water which is a chemical change.

-On the other hand, an example of decomposition reactions are chemical reactions which involves supplying heat to a substance; for example decomposing copper (II) nitrate which yields, copper (ii) oxide, nitrogen (iv) oxide and oxygen gas, is chemical reaction.

6 0

3 years ago