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How do spectrographs help astronomers classify stars

1 answer:

3 0

Answer:

A spectrograph is an instrument used to obtain and record an astronomical spectrum. The spectrograph splits or disperses the light from an object into its component wavelengths so that it can be recorded then analysed.

Explanation:

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Answer: 0.360 moles

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To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$

$\text{Moles of} FeCl_3=\frac{38.9g}{162.2g/mol}=0.240moles$

The balanced chemical reaction is:

$2Fe+3Cl_2\rightarrow 2FeCl_3$

According to stoichiometry :

2 moles of require = 3 moles of

Thus 0.240 moles of $FeCl_3$ will require= $\frac{3}{2}\times 0.240=0.360moles$ of $Cl_2$

Thus 0.360 moles of chlorine needed to react to produce 38.9 of iron (III) chloride.

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