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AnnyKZ [126]
3 years ago
12

Hey please answer this thanks.

Chemistry
1 answer:
Aleks04 [339]3 years ago
6 0

Explanation:

Percentage composition of oxygen = (80/134) * 100% = 59.7%.

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At what temperature would a 1.50 m nacl solution freeze, given that the van't hoff factor for nacl is 1.9? kf for water is 1.86
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Which hydrocarbon name adheres correctly to the IUPAC naming system? 3–ethyl–2,4–dimethylhexane 3–methethyl–2,dimethylhexane 4–d
faltersainse [42]
3–ethyl–2,4–dimethylhexane

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How much oxygen is typically required to complete a combustion reaction
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Answer:

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Explanation:

8 0
2 years ago
How many moles of o2 are required for the complete reaction of 54.7 g of c2h4 to form co2 and h2o?
Hunter-Best [27]
The balanced chemical equation that illustrates this reaction is:
<span>C2H4 + 3O2 --> 2CO2 + 2H2O 
</span>
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mass of hydrogen = 1 gram
Therefore:
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number of moles = mass / molar mass
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From the balanced equation above:
3 moles of oxygen are required to react with one mole of C2H4, therefore, to know the number of moles required to react with 1.95 moles of C2H4, all you have to do is cross multiplication as follows:
number of oxygen moles = (1.95*3) / 1 = 5.85 moles
4 0
3 years ago
Read 2 more answers
I really need your help
PilotLPTM [1.2K]

Answer:

Terrestrial

                   -20 to 30 degrees celsius average

                        (20 – 35 inches) of rain per year.

                     PLANTS: Grasses dominate temperate grasslands. Trees and large shrubs are rarely found in grassland areas

                gazelles, zebras, rhinoceroses, wild horses, lions, wolves, prairie dogs, jack rabbits, deer, mice, coyotes, foxes, skunks, badgers, blackbirds, grouses, meadowlarks, quails, sparrows, hawks, owls, snakes, grasshoppers, leafhoppers, and spiders.

            Grasslands are also known as prairies, pampas, steppes, and savannas.

Explanation:

6 0
2 years ago
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