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k0ka [10]
4 years ago
12

*Help Please!!*

Chemistry
2 answers:
dexar [7]4 years ago
7 0
It is spontaneous at 298 k.
NikAS [45]4 years ago
5 0
The correct answer is c
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A hot pot of water is set on the counter to cool. After a few minutes it has lost 495 J of heat energy. How much heat energy has
Brums [2.3K]

Answer:

495 J

Explanation:

When the hot pot was set on the counter to cool, heat energy was lost from the pot. Note that according to the first law of thermodynamics, heat is neither created nor destroyed.

This implies that, the heat energy lost from the pot must be gained by the surrounding air. Therefore, if 495 J of energy is lost from the pot, then 495 J of energy is gained by the surrounding air.

4 0
3 years ago
Consider a sample of 10.0 g of the gaseous hydrocarbon C2H6 to answer the following question: How many moles are present in this
Masja [62]

<u>Answer:</u> The moles of given hydrocarbon is 0.3 moles

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

We are given:

Given mass of ethane = 10.0 g

Molar mass of ethane = [(2\times 12)+(6\times 1)]=30g/mol

We need to divide the given value by the molar mass.

Putting values in above equation, we get:

\text{Moles of ethane}=\frac{10.0g}{30g/mol}=0.3mol

In case of multiplication and division, the number of significant digits is taken from the value which has least precise significant digits. Here, the least precise number of significant digits are 1.

Hence, the moles of given hydrocarbon is 0.3 moles

7 0
3 years ago
I don’t know this question please help
vekshin1

Answer: A. is elliptical

B. IS inrregulur  C. spiral

Explanation: this should be it

3 0
3 years ago
Which characteristic might identify a substance as an Arrhenius base?
Scorpion4ik [409]

Answer: a

Explanation: because an Arrhenius acid is a compound that increases the H + ion concentration in aqueous solution. An Arrhenius base is a compound that increases the OH − ion concentration in aqueous solution.

5 0
4 years ago
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Sara has a red jacket. Which of the following models shows how Sara's jacket reflects and/or absorbs light?
just olya [345]
I think it’s C. , C. Should be right because the red jacket is absorbing the light
7 0
4 years ago
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