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3 years ago

Uldilges of State

Chemistry

1 answer:

Harman [31]3 years ago

3 0

Answer:

Explanation:

Evaporation is a phase change from liquid to vapor. The right equation must show this change.

During evaporation, liquid acquires more heat energy and changes to gaseous form. In such processes, the molecules of the liquid break lose and becomes gases that are randomized.

H₂O $_{(l)}$ → H₂O $_{(g)}$

The expression above clearly shows water going from liquid to solid.

This should help to have a glimpse of how to solve this problem since the options are poorly written.

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Automotive air bags inflate when sodium azide, NaN3, decomposes explosively to its constituent elements. How many moles of nitro

attashe74 [19]

Answer:

2.29 g of N2

Explanation:

We have to start with the chemical reaction:

$NaN_3~->~Na~+~N_2$

The next step is to balance the reaction:

$2NaN_3~->~2Na~+~3N_2$

We can continue with the mol calculation using the molar mass of

$NaN_3$ (65 g/mol), so:

$3.55~g~NaN_3\frac{1~mol~NaN_3}{65~g~NaN_3}=0.054~mol~NaN_3$

Now, with the molar ratio between $NaN_3$ and $N_2$ we can calculate the moles of $N_2$ (2:3), so:

$0.054~mol~NaN_3\frac{3~mol~N_2}{2~mol~NaN_3}=0.0819~mol~N_2$

With the molar mass of $N_2$ we can calculate the grams:

$0.0819~mol~N_2=\frac{1~mol~N_2}{28~g~N_2}=2.29~g~N_2$

I hope it helps!

5 0

3 years ago

Arrange the following molecules in order of increasing bond polarity (highest bond polarity at the bottom):

Tom [10]

NF3– 0.94– third
NCl3–0.12– second
NBr3–0.08– first
CF4–1.43– fourth

NBr3—NCl3—NF3—CF4
Lowest. Highest

4 0

2 years ago

1. Propane gas (C3H8) burns completely in the presence of oxygen gas (O2) to yield carbon dioxide gas (CO2) and water vapor (H2O

vovikov84 [41]

1) Balanced equation

C3H8 + 5O2 -> 3 CO2 + 4 H2O

2) 0.700 L C3H8

Given the pressure and temperature do not change, the molar ratio is equivalent to volume ratio

1molC3H8 / 5 mol O2 => 1 L C3H8 / 5 L O2

0.700 L C3H8 / x L O2 = 1 L C3H8 / 5 L O2 => x = 0.700 L C3H8 * 5 L O2 / 1 L C3H8

x = 3.500 L O2

3) CO2 produced

1 L C3H8 / 3 L CO2 = 0.700 L C3H8 / x L CO2 =>

x = 0.700 L C3H8 * 3 L CO2 / 1 L C3H8 = 2.100 L CO2

4) Water vapor produced

1) 1 L C3H8 / 4 L H2O = 0.700 LC3H8 / x L H2O =>

x = 0.700 L C3H8 * 4 L H20 / 1 L C3H8 = 2.800 L H2O

3 0

3 years ago

Which of the following would be a testable hypothesis for an experiment that compares the health of salmon raised in fish farms

Nookie1986 [14]

If Salmon are raised in a fish farm then they will be healthier since they aren't being exposed to predators or disease.

I'm not fully sure if this is good enough since it seemed like your question had multiple choice but this is generally a testable hypothesis.

7 0

3 years ago

Read 2 more answers

What are the units for speed A. m/s B. km/s ^ 2 C. m/s^2 D. m^2/s^2

Rom4ik [11]

m/s is the correct answer of them.

3 0

3 years ago