Chemistry, 20.08.2019 10:00 SKYBLUE1015

What is the molecular formula of a compound made of 25.9% n and 74.1% o?
a. no
b. no₂
c. n₂o
d. n₂o₅
e. n₂o4₄
it would be great if you could add a few words of explanation

Answers: 2

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Answer from: iva60

If we take a sample of 100g of the given compound, we should find that it contains 74.1g of oxygen and 25.9g of nitrogen. The molar masses of oxygen and nitrogen are approximately 16.0g/mol and 14.0g/mol respectively. To find the appropriate number of moles of oxygen and nitrogen found in one mole of the given compound, we divide the mass of the sample by the molar mass of each substance.

For oxygen: 74.1g/(16.0g/mol) = 4.63125 mol (round up to 5 mol)

For nitrogen: 25.9g/(14.0g/mol) = 1.85 mol (round up to 2 mol)

Therefore one mole of this compound contains 2 moles of nitrogen and 5 moles of oxygen.

Answer from: alystidham1439

74.1% + 25.9% = 100%

we assume 100g of sample

100%100g
25.9% N x
x 25.9g N

100g - 25.9g = 74.1g O

mass of N = 14g
mass of O = 16g

1 mole of N 14g
x moles of N 25.9g
x = 1.85 moles of N

1 moles of O 16g
x moles of O 74.1g
x = 4.6 moles of O

N : O = 1.85 : 4.6
we share by the smallest value
N : O = 1.85 : 4.6 ||:1.85
N : O = 1 : 2.4 ≈ 1 : 2
NO₂
B

Answer from: Quest

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –

6.022

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,

will have a gram-molecular weight of 352g.

Answer from: Quest

4- c, because all matter stays the same no matter what. it is still there. 5- b, because matter is known as mass. 6-c because, flammability is a chemical property. malleability is changing the shape of an object.

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What is the molecular formula of a compound made of 25.9% n and 74.1% o?
a. no
b. no₂<...

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