To recognize the variety of helium atoms current in a provided mass of helium, we initially convert the mass into variety of moles by splitting the atomic mass of helium which is 4 grams per mole. Then, we multiply the Avogadro"s number which represents the number ofsystems in one mole of any type of substance. This has the worth of 6.022 x 10^23 units /mole. We perform as follows:537 kg He ( 1000 g / 1 kg ) ( 1 mol / 4 g ) ( 6.022 x 10^23 atom / mol ) = 8.08x10^28 atoms He


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A 9.780 -g gaseous mixture includes ethane (C2H6) and propane (C3H8). Complete burning to develop carbon dioxide and water requi

sdrta.net:

The mass % of ethane is 29.1 %

Explanation:

Tip 1: data given

Mass of gaseous mixture = 9.780 grams

Mixture contains ethane and propane

Moles of oxygen required = 1.120 moles

Molar mass O2 = 32 g/mol

Molar mass 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

Tip 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 moles

Tip 4: Calculate mass ethane

2/7 * 30*0.3325 = 2.85 grams

Step 5: Calculate % of ethane

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

% ethane = 29.1 %

The mass % of ethane is 29.1 %


7 0
5 months ago

Fire destroys the mass of the fuel that it burns. True or False
netinesdrta.net <11>
FalseBurning and also other changes in issue perform not ruin issue. The mass of issue is constantly the same before and after the transforms occur. The regulation of conservation of mass states that matter cannot be developed or destroyed.
6 0
4 months ago

The number of electrons in a neutral atom of an facet is always equal to the number of prolots in that aspect. True or False
xxMikexx <17>

sdrta.net:

True

Explanation:

In a neutral atom, the number of prolots and electrons are equal.


6 0
11 months ago

Which of the following is true concerning a voltaic (or galvanic) cell? a) It deserve to only be offered via hydrogen. b) It produces elec
N76 <4>

sdrta.net:

b) It produces electric existing spontaneously.

Explanation:

Cells qualified of converting chemical power to electrical energy and vice versa are termed Electrochemical cells. Tright here are two types of electrochemical cells viz: Galvanic or Voltaic cells and also Electrolytic cells. Voltaic cell is an elctrochemical cell capable of generating electrical power from the chemical reaction occuring in it.

The voltaic cell uses spontaneous reduction-oxidation (redox) reactions to geneprice ions in a fifty percent cell that reasons electric curleas to circulation. An fifty percent cell is a part of the galvanic cell where either oxidation or reduction reaction is occurring. Hence, the spontaneous manufacturing of electrical currents is true about Voltaic/Galvanic cells.


3 0
10 months ago
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