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3 years ago

Which substance is most likely metallic

Chemistry

2 answers:

Montano1993 [528]3 years ago

8 0

I don’t know “which substance” are you talking about??

You can put the picture there so we can see.

erastova [34]3 years ago

6 0

Answer:

The answer is C

Explanation: I got it right on edg

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What is the delta H when 72.0 grams H2O condenses at 100.00C?

algol [13]

<u>Answer:</u> The value of $\Delta H$ is -163 kJZ

<u>Explanation:</u>

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ......(1)

We are given:

Given mass of water = 72.0 g

Molar mass of water = 18 g/mol

Putting values in equation 1, we get:

$\text{Moles of water}=\frac{72.0g}{18g/mol}\\\\\text{Moles of water}=4mol$

Calculating the heat released for the condensation process:

$\Delta H=n\times \Delta H_{(vap)}$ ......(2)

where,

$\Delta H$ = amount of heat released

n = number of moles of water = 4 moles

$\Delta H_{(vap)}$ = specific heat of vaporization = -40.7 kJ/mol

Negative sign represents the amount of heat released.

Putting values in equation 2:

$\Delta H=4mol\times (-40.7kJ/mol)=-163kJ$

Hence, the value of $\Delta H$ is -163 kJ

4 0

3 years ago

If 4.5 mol of C6H8O7 react, how many moles of CO2 and Na3C6H5O7 will be produced?

Salsk061 [2.6K]

Answer:

A. 13.5 moles of CO2

B. 4.5 moles of Na3C6H5O7

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

3NaHCO3(aq) + C6H8O7(aq) → 3CO2(g) + 3H2O(s) + Na3C6H5O7(aq)

A. Determination of the number of mole CO2 produced from the reaction. This is illustrated below:

From the balanced equation above,

1 mole of C6H8O7 reacted to produce 3 moles of CO2.

Therefore, 4.5 moles of C6H8O7 will react to produce = 4.5 x 3 = 13.5 moles of CO2.

From the above calculation, 13.5 moles of CO2 is produced

B. Determination of the number of mole of Na3C6H5O7 produced by the reaction. This is illustrated below:

From the balanced equation above,

1 mole of C6H8O7 produced 1 mole of Na3C6H5O7.

Therefore, 4.5 moles of C6H8O7 will also produce 4.5 moles of Na3C6H5O7.

Therefore, 4.5 moles of Na3C6H5O7 is produced from the reaction.

5 0

3 years ago

If the temperature is below zero, what will the precipitation most likely be?

Leviafan [203]

Answer: C Snow

Explanation:

Because the temperature is low and it is below freezing temperature. Sorry if I am wrong.

7 0

3 years ago

. Which of the following statement is FALSE about gas particles? a. Gases expand to fill their container. b. Gases increase in m

lions [1.4K]

Answer:

Explanation:

5 0

3 years ago

Which element is composed of molecule that each contain a multiple covalent bond?

Ahat [919]

Nitrogen is the answer

8 0

3 years ago