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3 years ago

(show all your work)

Chemistry

2 answers:

ohaa [14]3 years ago

6 0

60 mph 4hoursx15 miles they would have to be going 60mph

Dima020 [189]3 years ago

5 0

Answer: If you were in a car and maintained an average speed of 60mph (96 kmh) over the course of your it would take you around 3.72 hours to get from Dallas to Shreveport.

Explanation: i just had to calculate the time and the distance and how long it would take with different speeds and this is the closest one i got.

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As the temperature increases, what happens to the solubility of a gas?

kati45 [8]

Not increases it DECREASES because the gas will have too much energy to dissolve in the solution

6 0

3 years ago

A 40.4 g sample of a protein contains 17.16 g of carbon, 3.17 g of hydrogen, 13.71 g of oxygen, and the rest being nitrogen. Thi

lukranit [14]

<h3>The molecular formula of this protein : C₁₈H₄₂O₁₂N₆</h3><h3>Further explanation </h3>

The empirical formula is the smallest comparison of atoms of compound forming elements.

A molecular formula is a formula that shows the number of atomic elements that make up a compound.

(empirical formula) n = molecular formula

The principle of determining empirical formula and molecular formula

Determine the mass ratio of the constituent elements of the compound.
Determine the mole ratio by dividing the elemental mass with the relative atomic mass obtained by the empirical formula
Determine molecular formulas by looking for values of n

Find mol ratio for every component :

C (Ar=12 g/mol):

$\tt \dfrac{17.16}{12}=1.43$

H(Ar=1 g/mol) :

$\tt \dfrac{3.17}{1}=3.17$

O(Ar=16 g/mol) :

$\tt \dfrac{13.71}{16}=0.857$

N (r=14 g/mol) :

Mass of Nitrogen :

40.4-(17.16+3.17+13.71)=6.36 g

$\tt \dfrac{6.36}{14}=0.454$

C : H : O : N = 1.43 : 3.17 : 0.857 : 0.454 = 3.15 : 7 : 1.89 : 1=3:7:2:1

Empirical formula : C₃H₇O₂N

Molecular mass of protein :

$\tt \dfrac{40.4}{0.07141}=565.75$

(C₃H₇O₂N)n=565.75

(12.3+1.7+2.16+14)n=565.75

(89)n=565.75

n=6.4≈6

so the molecular formula : C₁₈H₄₂O₁₂N₆

6 0

3 years ago

Apollo 11 made a ______ landing.

antiseptic1488 [7]

Answer:

Apollo 11 made a capsule landing

Explanation:

6 0

3 years ago

2C4H10+1302 -> 8CO2 + 10H₂O

kondaur [170]

Answer:

.137 moles

Explanation:

need to know the molar mass of water which is 18.01528 g/mol

2.46 g of H₂O divided 18.01528 g/mol molar mass H₂O = moles of H₂O

2.46 divided by 18.01528 =

.137 moles

C4H10 is butane

butane is commonly used in cigarette lighters

2C4H10+1302 -> 8CO2 + 10H₂O is the burning of butane

burning butane with oxygen makes carbon dioxide and water

vsumhcwagovau

7 0

2 years ago

If 6.35 g of cu(no3)2 is dissolved in water to make a 0.750 m solution, what is the volume of the solution (in ml)?

miv72 [106K]

First, we need to find out how many moles we have of $Cu ( NO_{3} )_{2}$ if we are given 6.35g.

We need to calculate the molar mass of the molecule:

Cu: 63.546g
N: 14.01g * 2 = 28.02g
O: 15.999g * 6 = 95.994

Add them together to get: 187.56g

So now we need to find the number of moles we are given. This can be done by setting up a multiplication equation and cancelling the units:

$\frac{1mole}{187.56g}* \frac{6.35g}{1}=0.034 mol _{Cu( NO_{3} )_{2} }$

So now that we know the number of moles that we have, we can use the molarity equation to find the volume of the solution. The molarity equation is:

$Molarity= \frac{moles}{Liters}$

So since we are given the molarity in the equation (0.750 M), we can plug in the molarity and moles to find the volume of the solution:

$0.750= \frac{0.034mol}{volume(L)}$

$volume(L)=0.04533L$

So now we know that the volume is 0.04533 Liters; however the question asks for the answer in milliliters. To do this, we must multiply by 1000:

$\frac{0.045L}{1} * \frac{1000mL}{1L}=45.33mL$

So the volume of the solution (<em>in mL</em>) is 45.33 mL.

7 0

3 years ago