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2 years ago

15

2. Calculate the mass of Kool-Aid needed to make 0.1 L solutions at the following concentrations: a. 0.1 M b. 0.2 M c. 0.3 M d.

0.4 M e. 0.5 M

1 answer:

murzikaleks [220]2 years ago

4 0

477889654 that the mass

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Find How many joules of heat energy are needed to raise the temperature of 10grams of Aluminum from 20*C to 40*C. If the specifi

dmitriy555 [2]

Explanation:

the answer and the working out is shown above, hope it helps.

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3 years ago

You have a 28.2-g sample of a metal heated to 95.2°c. you drop it in a calorimeter with 100. g of water at 25.1°c. the final tem

Vlad [161]

The heat lost by the metal should be equal to the heat gained by the water. We know that the heat capacity of water is simply 4.186 J / g °C. Therefore:

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3 years ago

Equation balancing

meriva

<u>Answer:</u>

<u>For a:</u> The balanced equation is $2S(s)+3O_2(g)\rightarrow 2SO_3(g)$

<u>For c:</u> The balanced equation is $2NaOH(s)+H_2SO_4(aq)\rightarrow Na_2SO_4(aq)+2H_2O(l)$

<u>Explanation:</u>

A balanced chemical equation is one where all the individual atoms are equal on both sides of the reaction. It follows the law of conservation of mass.

<u>For (a):</u>

The given unbalanced equation follows:

$S(s)+O_2(g)\rightarrow SO_3(g)$

To balance the equation, we must balance the atoms by adding 2 infront of both $S(s)$ and $SO_3$ and 3 in front of $O_2$

For the balanced chemical equation:

$2S(s)+3O_2(g)\rightarrow 2SO_3(g)$

<u>For (b):</u>

The given balanced equation follows:

$2Al(s)+3Cl_2(g)\rightarrow 2AlCl_3(s)$

The given equation is already balanced.

<u>For (c):</u>

The given unbalanced equation follows:

$2NaOH(s)+H_2SO_4(aq)\rightarrow Na_2SO_4(aq)+H_2O(l)$

To balance the equation, we must balance the atoms by adding 2 infront of $H_2O(l)$

For the balanced chemical equation:

$2NaOH(s)+H_2SO_4(aq)\rightarrow Na_2SO_4(aq)+2H_2O(l)$

<u>For (d):</u>

The given balanced equation follows:

$C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(g)$

The given equation is already balanced.

4 0

3 years ago

PLEASEEE HELP!!!

PIT_PIT [208]

i believe it would be B '' tetrahedral compound ''

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3 years ago

Read 2 more answers

The electron affinity of an element is positive if energy is absorbed during the process of accepting an electron and negative i

julsineya [31]

Answer:

See explanation

Explanation:

Electron affinity is the energy released when an extra electron is added to a neutral gaseous atom. A negative value of electron affinity indicates that energy is given out and vice versa.

Metals have positive electron affinity since electrons rarely accept electrons, so;

Na(g)+ 1e^- → Na^-(g) positive

Mg(g)+1e^- → Mg^-(g) positive

For the last case; Br(g)+ 1e^- → Br^-(g), the electron affinity for the non-metals is negative. hence the answer

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3 years ago