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3 years ago

If 5.0 moles of C3H8 react, how many molecules of water are formed?

1 answer:

4 0

Propane is C3H8

The balanced equation is:
C3H8 + 5 O2 --> 3 CO2 + 4 H2O
From the balanced equation you can see that for each mole of C3H8 you obtain 4 moles of H2O.

moles H2O = 5.0 moles C3H8(4 moles H2O/1 mole C3H8) = 20 moles H2O formed

Use Avogadro's number to find the number of molecules.
molecules H2O = 20 moles H2O(6.02 x 10^23 molecules/1 mole) = 1.20 x 10^25 H2O molecules

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A 8.00 L tank at 26.9 C is filled with 5.53 g of dinitrogen difluoride gas and 17.3 g of sulfur hexafluoride gas. You can assume

pshichka [43]

Answer:

mole fraction of N_2 O = 0.330

mole of fraction SF_4 = 0.669

PRESSURE OF N_2 O = 39127.053 Pa

pressure of SF_4 = 792126.36

Total pressure = 118253.413 Pa

Explanation:

Given data:

volume of tank 8 L

Weight of dinitrogen difluoride gas 5.53 g

weight of sulphur hexafluoride gas 17.3 g

Amount of $N_2 O = \frac{5.53}{14*2 + 16} = 0.1256 mol$

amount of $SF_4 = \frac{17.3}{32.1 + 19*4} = 0.254 mol$

mole fraction of $N_2 O = \frac{0.1256}{0.1256 + 0.254} = 0.330$

mole of fraction $SF_4 = \frac{0.254}{0.1256 + 0.254} = 0.669$

PV = nRT

P of N_2 O $= \frac{0.1256 *8.31 (273 + 26.9}{0.008} = 39127.053 Pa$

mole of SF_4 $=\frac{0.254 *8.31*(273+26.9)}{.008} = 79126.36 Pa$

Total pressure = 39127.053 + 79126.36 = 118253.413 Pa

6 0

3 years ago

What part of the microscope is the letter k?

snow_tiger [21]

Answer:

if you are asking k then the round one is condenser

if not then its a stage clip

6 0

3 years ago

5. Rubbing alcohol is a commonly used disinfectant and has a cooling effect when applied to the skin. The active ingredient in r

WITCHER [35]

Answer:

Explanation:

70% (vol/vol) means

cotnaimns 70 %(vol/vol) 70 ml of isoprapnol is there in 100 ml of Rubbing sold alcohol.

if it is 200 ml then obvouly it has the 70*2 =140 ml of isoproanol required.

8 0

3 years ago

Group 17 is called the halogen family, and the group to its right is called the noble gases. How are these elements alike and ho

Vesnalui [34]

Explanation:

The halogen family and noble gases are similar in just one particular way, they are groups of non-metals. All members of these two groups are categorized as non-metals.

Here are some of the differences between them;

Halogens have 7 electrons in their outermost shell whereas noble gases have 8 electrons in theirs.
Halogens are highly reactive elements, noble gases are non-reactive.
Halogens are made up of electronegative elements where as noble gases are neither electropositive nor electronegative.

4 0

3 years ago

How many protons, electrons, and neutrons does the following isotope contain? ^{18} \text{F}^{-} 18 F −

melomori [17]

Isotope ¹⁸F⁻ contains:
1) p⁺ = 9; number of protons.
Fluorine has atomic number Z = 9 (total number of protons).
2) e⁻ = 10; number of electrons.
In element number of electrons and protons are the same, because element has neutral charge, but because in this example, fluorine is anion with negative charge, it has one electron more.
3) n° = 9; number of neutrons.
Mass number A = 18 is total number of protons and neutrons in a nucleus, so number of neutrons is A-Z = 18-9=9.

8 0

3 years ago