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Romashka-Z-Leto [24]
3 years ago
11

Almost all characteristics of a star are determined by its

Chemistry
1 answer:
Natasha2012 [34]3 years ago
3 0
Red giant would be the answer here
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1. How many moles of oxygen gas are needed to form 21.8 liters of water vapor?
BaLLatris [955]

0.781 moles

Explanation:

We begin by balancing the chemical equation;

O₂ (g) + 2H₂ (g) → 2H₂O (g)

21.8 Liters = 21.8 Kgs

To find how many moles are in 28.1 Kg H₂O;

Molar mass of H₂O = 18 g/mol

28.1/18

= 1.56 moles

The mole ratio between water vapor and oxygen is;

1 : 2

x : 1.56

2x = 1.56

x = 1.56 / 2

x =  0.781

0.781 moles

7 0
2 years ago
Which substance used during photosynthesis does a plant take in from the soil?
Simora [160]

Answer:

the answer is water

Explanation:

During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil. Within the plant cell, the water is oxidized, meaning it loses electrons, while the carbon dioxide is reduced, meaning it gains electrons. This transforms the water into oxygen and the carbon dioxide into glucose.

3 0
2 years ago
Read 2 more answers
What would happen if uranium-241 lost 2 protons and 2 neutrons?
kupik [55]
If uranium-241 lost 2 protons and 2 neutrons, then  thorium-237 would be produced. The number beside the element is the mass number which is the sum of protons and neutrons.  If uranium would lose 2 protons and 2 neutrons, then the mass number would decrease by 4 making it 237. Looking in a periodic table, thorium is the element which has a mass number of 237.
5 0
3 years ago
3. I have 10 moles of a gas mixture. If there are 2.7 moles of hydrogen gas
UkoKoshka [18]

Answer:

there are two moles

Explanation:

6 0
3 years ago
Balance the equation ___ CaCO3 -> ____ CaO + ____ CO2
Degger [83]

Answer:

CaCO3 -> CaO + CO2

Explanation:

Woahhhh, did you balance it yourself just then?

3 0
2 years ago
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