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3 years ago

How many moles of MgS2O3 are in 205 g of the compound?

2 answers:

6 0

$Mol = \frac{mass}{molar mass}$

Mass of the compound = 205 g
Molar Mass of compound = ((24) + (2 * 32) + (3 * 16))
= 136 g / mol

∴ # mols in 205g = $\frac{205 g}{136 g / mol}$
= 1.507 mol

serg [7]3 years ago

6 0

Since a mol of MgS2O3 weights 136gr (the same weight as the atomic weight for that compound, but measured in gr), you just have to divide the mass you have (205) by that one (136), resulting in 1'514 moles.

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5000kg/m³

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Which of the following is a chemical change?

FromTheMoon [43]

Answer:

Silver tarnishing as the silver metal reacts with sulphur is a chemical change.

Explanation:

Tarnishing is the process of chemical change occurring on the surface of objects leading to corrosion or other defects on the surface. The remaining options like dilution, eroding is a physical change where the concentration of salt and rock particles will be decreased, respectively.

Similarly for soil drying also the concentration of water will be decreased leading to a physical change from wetty or dry soil.

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3 years ago

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How do you convert kilograms to pounds?

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2 years ago

What is the longest wavelength in the Balmer series? (Hint: the Rydberg constant for Hydrogen is 1.096776×107 1/m, and the Balme

boyakko [2]

Answer: The longest wavelength of light is 656.5 nm

Explanation:

For the longest wavelength, the transition should be from n to n+1, where: n = lower energy level

To calculate the wavelength of light, we use Rydberg's Equation:

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Where,

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$n_i$ = Lower energy level = 2 (Balmer series)

Putting the values in above equation, we get:

$\frac{1}{\lambda }=1.096776\times 10^7m^{-1}\left(\frac{1}{2^2}-\frac{1}{3^2} \right )\\\\\lambda =\frac{1}{1.5233\times 10^6m^{-1}}=6.565\times 10^{-7}m$