To determine the number of helium atoms existing in a offered mass that helium, we very first convert the massive into number of moles by separating the atom mass of helium i beg your pardon is 4 grams every mole. Then, us multiply the Avogadro"s number which represents the number ofunits in one mole of any kind of substance. This has the value of 6.022 x 10^23 devices /mole. We carry out as follows:537 kg the ( 1000 g / 1 kg ) ( 1 mol / 4 g ) ( 6.022 x 10^23 atom / mol ) = 8.08x10^28 atom He


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A 9.780 -g gas mixture has ethane (C2H6) and propane (C3H8). Complete burning to form carbon dioxide and also water requi

sdrta.net:

The fixed % of ethane is 29.1 %

Explanation:

Step 1: data given

Mass of gas mixture = 9.780 grams

Mixture includes ethane and propane

Moles that oxygen necessary = 1.120 moles

Molar massive O2 = 32 g/mol

Molar massive of ethane = 30.07 g/mol

Molar mass of propane = 44.1 g/mol

Step 2: The well balanced equations

C2H6 + 7/2 O2 → 2CO2 + 3H2O

C3H8 + 5O2 → 3CO2 + 4H2O

Step 3: calculate moles

n(C2H6) / n(O2) = 1 / 3.5 = 1/X

m(C2H6) = 3.5x mole * 30.07 g/mol

n(C3H8) /n(O2) = 1/5 = x / (1.12 -x)

m(C3H8) = (1.12 - x) /5 * 44.1 g/mol

3.5 * 30x + 1/5 *44.1 (1.12-x) = 9.780 grams

x = 0.3325 mole

Step 4: calculate mass ethane

2/7 * 30*0.3325 = 2.85 grams

Step 5: calculation % the ethane

% ethane = (2.85 grams / 9.78 grams ) * 100%

% ethane = 29.1 %

The fixed % of ethane is 29.1 %


7 0
5 months ago

Fire destroys the fixed of the fuel the it burns. True or False
netinesdrta.net <11>
FalseBurning and other transforms in issue do not destroy matter. The massive of issue is constantly the same before and also after the alters occur. The regulation of conservation of mass says that matter cannot be developed or destroyed.
6 0
4 month ago

The variety of electrons in a neutral atom that an aspect is constantly equal to the variety of protons in the element. True or False
xxMikexx <17>

sdrta.net:

True

Explanation:

In a neutral atom, the number of protons and also electrons space equal.


6 0
11 month ago

Which the the following is true concerning a voltaic (or galvanic) cell? a) It can only be supplied with hydrogen. B) that produces elec
N76 <4>

sdrta.net:

b) the produces electrical existing spontaneously.

Explanation:

Cells qualified of converting chemical power to electric energy and vice versa space termed Electrochemical cells. There are two varieties of electrochemical cell viz: Galvanic or Voltaic cells and Electrolytic cells. Voltaic cell is an elctrochemical cell capable of generating electric energy indigenous the chemical reaction occuring in it.

The voltaic cell uses spontaneous reduction-oxidation (redox) reactions to generate ion in a half cell that reasons electric currents come flow. An fifty percent cell is a component of the galvanic cell wherein either oxidation or palliation reaction is taking place. Hence, the spontaneous production of electric currents is true around Voltaic/Galvanic cells.


3 0
10 month ago
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