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blagie [28]
3 years ago
9

The Lewis structure of HCN contains _______.

Chemistry
1 answer:
MaRussiya [10]3 years ago
6 0
It is B. One single bond and one triple bond.
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Enter your answer in the provided box. From the data below, calculate the total heat (in J) needed to convert 0.304 mol of gaseo
diamong [38]

Answer:

-35,281.5 J

Explanation:

To convert the gaseous ethanol to liquid ethanol, three steps will occur. First, it will lose heat and the temperature will decrease until its boiling point, so from 300.0°C to 78.5°C. Thus, more heat will be lost, but now, with the temperature constant, so the gas will be converted to liquid. And then, the liquid will lose heat to decrease the temperature from 78.5°C to 25.0°C.

The total heat loss is the sum of the heats of each step. Because the heat is being removed from the system, it's negative. The first and last step occurs with a change in temperature, and so the heat is calculated by:

Q = m*c*ΔT

Where m is the mass, c is the specific heat of the gas (first step) or liquid (last step), and ΔT the temperature variation (final - initial). The mass of ethanol is the molar mass 46.07 g/mol multiplied by the number of moles, so:

m = 46.07 * 0.304 = 14.00 g

The second step occurs without a change in temperature, and the heat is then:

Q = -n*ΔH°vap

Where n is the number of moles, ΔH°vap is the heat of vaporization, and the minus signal indicates that the heat is being lost. Then, the heat of each step is:

Q1 = 14.00*1.43*(78.5 - 300,0) = -4434.43 J

Q2 = -0.304*40.5 = -12.312 kJ = -12312 J

Q3 = 14.00*2.45*(25.0 - 78.5) = -1835.05 J

Q = Q1 + Q2 + Q3

Q = -35,281.5 J

5 0
3 years ago
Can anyone help me on this please.
exis [7]
It would have to be 40.0 only because it wouldn’t add up
8 0
2 years ago
Read 2 more answers
Give the name of reaction in the<br> preparation of alkene from alcohol<br> compounds.
pickupchik [31]

Dehydration to alkenes!

3 0
3 years ago
When hydrogen is combined with a metal, it has an oxidation number of _____.
solmaris [256]
The answer is c because thats the number when combined with a metal. +1 is when its combined with a nonmetal. 
8 0
3 years ago
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.
murzikaleks [220]
477889654 that the mass
4 0
2 years ago
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