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3 years ago

Final setup in scientific method

Chemistry

1 answer:

Mrrafil [7]3 years ago

3 0

Answer:

The final step is to REPORT!!!

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The fifth shell can hold up to 50 electrons and the forth shell can hold 8 electrons

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2 years ago

Your cotton T-shirt smells when you take it out of the clothes dryer. Explain why.

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When the T-shirt comes out of the clothes dryer, it is so warm that molecules from the detergent and fabric soft ener are likely to have changed phase and become gases. When they reach your nose, you are able to smell them.

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2 years ago

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3 years ago

What mass of ice can be melted with the same quantity of heat as required to raise the temperature of 3.00 mol H2O(l) by 50.0°C?

lions [1.4K]

Answer:

$m=33.9g$

Explanation:

Hello,

In this case, we can first compute the heat required for such temperature increase, considering the molar heat capacity of water (75.38 J/mol°C):

$Q=nCp \Delta T=3.00mol*75.38\frac{J}{mol\°C} *50.0\°C\\\\Q=11307J$

Afterwards, the mass of ice that can be melted is computed by:

$Q=n \Delta _{fus}H$

So we solve for moles with the proper units handling:

$n=\frac{Q}{\Delta _{fus}H} =\frac{11307J}{6010\frac{J}{mol} } =1.88mol$

Finally, with the molar mass of water we compute the mass:

$m=1.88mol*\frac{18g}{1mol}\\ \\m=33.9g$

Best regards.

7 0

2 years ago

What is the solubility of La(IO₃)₃ in a solution that contains 0.100 M IO₃⁻ ions? (Ksp of La(IO₃)₃ is 7.5 × 10⁻¹²)

love history [14]

Solution and Explanation:

[La3+] = 0.1 M

At the equilibrium:

La(IO3)3 <----> La3+ + 3 IO3-

0.1 +s 3s

$\mathrm{Ksp}=[\mathrm{La} 3+][\mathrm{IO} 3-]^{\wedge} 3$

$7.5 * 10^{\wedge}-12=(0.1+s) *(3 s)^{\wedge} 3$

Since Ksp is small, s can be ignored as compared to the 0.1

The above shown expression thus becomes:

$7.5 * 10 \wedge-12=(0.1) *(3 s) \wedge 3$

$7.5 * 10^{\wedge}-12=0.1 * 27(\mathrm{s})^{\wedge} 3$

$s=1.406 * 10^{\wedge}-4 \mathrm{M}$

Answer: 1.4*10^-4 M

3 0

2 years ago