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Vinil7 [7]
3 years ago
10

Question 1 (Mandatory) (2.5 points)

Chemistry
1 answer:
natita [175]3 years ago
4 0
I believe that the answer for question 1 is 4 and the reason for that is because that’s how the water cycle work and how it keeps going and it’s all because of the sun and the answer for 2 is 1and it’s because the carbon cycle is when is being taken in by plants so they can be able to release oxygen but it also need sunlight to be able to make its own good and keep the cycle going
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Iron(III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2O3 are formed when 33.4 g of Fe reacts
konstantin123 [22]

    The grams of  Fe₂O₃   that are formed is  47.68 g

<u><em>calculation</em></u>

Step 1: write   the equation for reaction

4 Fe +3O₂ → 2 Fe₂O₃

Step 2: find  the  moles  of Fe

moles = mass÷  molar mass

 = 33.4 g÷55.8 g/mol =0.5986 moles

Step 3 : use the mole ratio to determine the moles of Fe₂O₃

That is  from  equation above Fe:Fe₂O₃  is 4:2 therefore the moles of Fe₂O₃ is  =  0.5986 moles x 2/4 =0.2993 moles

Step 4 : find the mass  of Fe₂O₃

mass = mass x molar mass

The molar mass of Fe₂O₃  = (55.8 x 2 +(15.9 x3) = 159.3 g/mol

mass is therefore =  0.2993 moles x 159.3 g/mol =47.68 g

4 0
3 years ago
Read 2 more answers
Help me out with those two letters pls
GREYUIT [131]

Answer:

F. 1, 1

G. 1

Explanation:

When you work out how many there are of each thing, the numbers that were already in there equal each other, do you just need to add ones in the other blanks.

5 0
3 years ago
Help me understand molarity please
Katyanochek1 [597]
Molarity/ molar is a unit of concentration, symbolized by "M". It is the ratio of the number of moles of solute and the volume of solution.

Molarity = Moles of solute ÷ Liters of solution = moles/liter = M
molarity is define as the number of mole of a solute in 1 liter of solution
3 0
3 years ago
If a piece of marble has the mass of 132.796 g and the volume of 26.9 cm
Mashutka [201]

Answer:

4.94g/cm3.

Explanation:

4.94g/cm3.

8 0
3 years ago
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Which of the following is a sign of a chemical reaction?
Stels [109]
Color change , temp. change ,if a solid forms , umm there's probably more but that's all I remember
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