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3 years ago

Lily is doing a science experiment with a substance in a sealed jar. At first,

Chemistry

1 answer:

Serhud [2]3 years ago

6 0

Answer:

Faster, and the substance will be a gas.

Explanation:

I'm quite not sure with it. But, I've tried my best. Since maybe the substance is liquid

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Answer to this question. AP chem

MissTica

Answer:

Molecular formula = C₄F₈

Explanation:

Given data:

Empirical formula of compound = CF₂

Molar mass of compound = 200.4 g/mol

Molecular formula of compound = ?

Solution:

Formula:

Molecular formula = n ( empirical formula)

n = Molar mass of compound / empirical formula mass

empirical formula mass = CF₂ = 12+19×2 = 50 g/mol

n = 200.4 g/mol / 50 g/mol

n = 4

Molecular formula = n ( empirical formula)

Molecular formula = 4 ( CF₂)

Molecular formula = C₄F₈

8 0

3 years ago

In which of the following is the number of electrons the ion contains given correctly

larisa [96]

Answer:

B. K+ has 18 electrons

Explanation:

Ions are formed when atoms of element gain or loose electrons.
When an atom looses electrons it forms a positively charged ion and when an atom gains electrons it forms a negatively charged ion.
Metal atoms such as potassium, magnesium and aluminium looses outer most electrons to positively charged ions.
Potassium atom has 19 electrons, 19 protons, with an electronic configuration of 2 : 8 : 8 : 1. To form an ion, K looses an electron to form a positively charged potassium ion (K+) with 18 electrons and 19 protons and an electronic configuration of 2:8:8.

8 0

3 years ago

(NEED ANSWER NOW)

Anna11 [10]

Answer:it’s C

Explanation:

A distant luminous object travels rapidly away from an observer.

4 0

2 years ago

SEP Analyze Data Look at the phase diagram. What is the state of matter for methanol at a temperature of −0.1°C and a pressure o

devlian [24]

If it’s a negative number and a positive it might be 1.4

8 0

2 years ago

Consider the following reaction at constant pressure. Use the information provided below to determine the value of ΔS at 473 K.

Elis [28]

Answer:

The reaction will be spontaneous

Explanation:

To determine if the reaction will be spontaneous or not at this temperature, we need to calculate the Gibbs's energy using the following formula:

$\Delta G= \Delta H - T * \Delta S$

If the Gibbs's energy is negative, the reaction will be spontaneous, but if it's positive it will not.

Calculating the $\Delta G= -1267 - 473 K* \Delta S$ :

$\Delta G= -1267 - 473 K* \Delta S$

Now, other factor we need to determine is the sign of the S variation. When talking about gases, the more moles you have in your system the more enthropic it is.

In this reaction you go from 7 moles to 8 moles of gas, so you can say that you are going from one enthropy to another higher than the first one. This results in: $\Delta S>0[/tex}Back to this expression: [tex]\Delta G= -1267 - 473 K* \Delta S$

If the variation of S is positive, the Gibbs's energy will be negative always and the reaction will be spontaneous.

4 0

3 years ago