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Sindrei [870]
4 years ago
13

How do I calculate the molecular formula for a compound with an empirical formula CH2O and a molar mass of 90 g/mol?

Chemistry
1 answer:
adell [148]4 years ago
5 0
CH2O = 12 + 2 + 16 = 30 g/mol
90 g/mol / 30 g/mol = 3
3 x (CH2O) = C3H6O3
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It takes 486.0 kJ/mol to convert sodium atoms to Na+ ions. Sodium atoms absorb and emit light of wavelengths 589.6 and 590.0 nm.
solmaris [256]
We first calculate the energy contained in one photon of this light using Planck's equation:

E = hc/λ

E = 6.63 x 10⁻³⁴ x 3 x 10⁸ / 590 x 10⁻⁹
E = 3.37 x 10⁻²² kJ/photon

Now, one mole of atoms will excite one mole of photons. This means that 6.02 x 10²³ photons will be excited

(3.37 x 10⁻²² kJ/photon) x (6.02 x 10²³ photons / mol)

The energy released will be 202.87 kJ/mol
8 0
4 years ago
38 An aluminum sample has a mass of 80.01 g and a density of 2.70 g/cm3. According to the data, to what number of significant fi
Furkat [3]
The answer is (3) 3. The calculation rule of significant figures is when multiplication and division, the significant figures of result is equal to the least of the numbers involved. The significant figure of 2.70 and 80.01 is 3 and 4.
3 0
3 years ago
Read 2 more answers
Calculate the mass of 6.9 moles of nitrous acid (HNO2). Explain the process or show your work by including all values used to de
AlexFokin [52]

Answer:- 324.3 grams.

Solution:-  We have been given with 6.0 moles of nitrous acid and asked to calculate it's grams. Moles to grams is a unit conversion and for doing this conversion we multiply the given moles by the molar mass of the compound.

Molar mass is the formula mass and to calculate this the atomic masses of each atom are multiplied by their respective subscripts that is the number of the atom in the compound .

For example, NO_2 has one nitrogen atom and one oxygen atom. So, the molar mass of this is = atomic mass of N + 2(atomic mass of O)

= 14 + 2(16)

= 14 + 32  

= 46 gram per mol

gram per mol is the unit of molar mass. So, the molar mass of NO_2 is 46 grams per mol.

Let's calculate the molar mass of nitrous acid using the same concept.

molar mass of [HNO_2 = 1 + 14 + 2(16)

= 1 + 14 + 32

= 47 grams per mol

Now, 6.9 moles of nitrous acid could easily be converted to grams as:

6.9molHNO_2(\frac{47g}{1mol})

= 324.3 g

Hence, the mass of 6.9 moles of nitrous acid is 324.3 grams.

6 0
3 years ago
How can you separate a mixture containing two different liquids? filtration evaporation distillation magnetic attraction
maxonik [38]
Distillation I believe.....
7 0
4 years ago
How are elements and compounds are different
navik [9.2K]
AN element is composed from atoms with the same number of protons,
 A compound contain two or more different elements
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