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3 years ago

13

Determine the molecular formula for a compound that has a Mass of 392.2 grams and consists of 0.70g of chromium,0.65g of sulfur

and 1.30 grams of oxygen

1 answer:

babunello [35]3 years ago

4 0

Explanation:

yuyfjkvg8hvcrnkffhbbbvvggh

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A spectrophotometer measures the transmittance or the absorbance, or both, of a particular wavelength of light after it has pass

lutik1710 [3]

Answer:

The cuvette will only fit into the spectrophotometer in one orientation.

Explanation:

There is an arrow always marked on the cuvette that indicates how to place it inside the spectrophotometer. The sides of the cuvette also have small edges that if light passes through them, spurious light can be detected due to poor positioning. The spurious light does not get through the entire sample, if we want to measure the absorbance. With a cuvette in the indicated position, the procedure is measured and its reference value is taken, and then compared with other cuvettes to be used.

Look the picture!

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3 years ago

A hot 123.3 g lump of an unknown substance initially at 164.2 °C is placed in 35.0 mL of water initially at 25.0 °C and the syst

Anuta_ua [19.1K]

Answer:

The unknown substance is rhodium.

Explanation:

Heat lost by hot substance will be equal to heat gained by the water

$-Q_1=Q_2$

Mass of substance= $m_1=123.3 g$

Specific heat capacity of substance= $c_1=?$

Initial temperature of the substance = $T_1=164.2^oC$

Final temperature of substance= $T_2=T=48.6^oC$

$Q_1=m_1c_1\times (T-T_1)$

Mass of water = M

Volume of water ,V= 35 ml

Density of water = d = 1.00 g/mL

$M=d\times V=1.00 g/ml\times 35 mL=35 g$

Mass of water= $M = m_2=35 g$

Specific heat capacity of water= $c_2=4.184 J/g^oC$

Initial temperature of the water = $T_3=25.0^oC$

Final temperature of water = $T_3=T=48.6^oC$

$Q_2=m_2c_2\times (T-T_3)$

$-Q_1=Q_2$

$-(m_1c_1\times (T-T_1))=m_2c_2\times (T-T_3)$

On substituting all values:

we get, $c_1 =0.242 J/g^oC$

The value of heat capacity of the substance is equal to that of rhodium metal.Hence, the unknown substance is rhodium.

4 0

3 years ago

It takes 338. kJ/mol to break an carbon-chlorine single bond. Cal broken by absorbing a single photon Iculate the maximum wavele

vodomira [7]

Answer:

354 nm

Explanation:

$E=\frac{h\times c}{\lambda}$

Where,

h is Plank's constant having value $6.626\times 10^{-34}\ Js$

c is the speed of light having value $3\times 10^8\ m/s$

$\lambda$ is the wavelength of the light

So, Given that:- Energy = 338. kJ/mol = 338000 J/mol

Also, $N_a=6.023\times 10^{23}\ {mol}^{-1}$

So, Energy for single photon = $\frac{338000}{6.023\times 10^{23}}\ J$

Applying the values in the above equation as:-

$\frac{338000}{6.023\times 10^{23}}=\frac{6.626\times 10^{-34}\times 3\times 10^8}{\lambda}$

$69\times \:10^{26}\lambda=5^{20}\times \:62770482.511$

$\lambda=354\times 10^{-9}\ m=354\ nm$

5 0

3 years ago

I need help with Question 6 (A,B,C)

LenKa [72]

I think the anwser is A but I'm not sure so I might need to get somebody else's opinion like i said I'm sorry if it's wrong

6 0

3 years ago

Why is iodine placed just after tellurium on the periodic table even though its atomic mass is less than the atomic mass of tell

dem82 [27]

Iodine follows Tellurium in the periodic table of the elements due to its higher atomic number. The atomic number (the number of protons in the nucleus) of Iodine is 53, while that of Tellurium is 52. The elements are not arranged by atomic mass.

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3 years ago