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anastassius [24]

3 years ago

15

How was the earth crust percentage determined ?

1 answer:

Troyanec [42]3 years ago

5 0

By how thick or slim it is

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PLZZZ HELP FASSSSSSSSSSSSTTTTTTTTTTTTT

aleksandrvk [35]

Answer:

i think multipling 30 to the 40

30 × 40 = 1200ppt

7 0

3 years ago

A popular classroom demonstration consists of filing notches into a new penny and soaking the penny in hydrochloric acid overnig

Ivanshal [37]

Answer:

$HCl conc=2.2M$

Explanation:

From the question we are told that:

Mass of zinc $Mass_{z_n}=2.5g$

Initial conc of HCl $HConc_1=6.0M$

Initial volume of HCl $Hvol_1=20.0mL$

Molar mass of zinc $M_{Z_n}=65.38g/mol$

Generally the equation for reaction is mathematically given by

$2HCL+Zn\implies ZnCl_2 +H_2$

Generally the equation for moles of zinc $m_{z_n}$ is mathematically given by

$m_{z_n}=\frac{Mass_{Z_n}}{M_{Z_n}}$

$m_{z_n}=\frac{2.5g}{M_{65.38}}$

$m_{z_n}=0.038molZn$

Generally the equation for moles of $m_{HCl}$ is mathematically given by

$m_{HCl}=HConc_1*Hvol_1$

$m_{HCl}=6.0M*20.0mL$

$m_{HCl}=6.0M*20.0*10^{-3}L$

$m_{HCl}=0.12\ mol\ HCl$

Generally the reacted moles of HCl $HCl_[reacted]$ is mathematically given by

Since

Zn:HCl =1:2

Therefore

$HCl_[reacted]=0.038*\frac{2}{1}$

$HCl_[reacted]=0.076mol \ HCl$

Generally the moles of HCl after Zn oxidization X is mathematically given by

$x=0.12-0.076$

$x=0.044 mol HCl$

Generally the conc of hydrochloride acid X is mathematically given by

$X=\frac{0.044}{0.020}$

$X=2.2 M Hcl$

Therefore Conc of HCl

$HCl conc=2.2M$

5 0

3 years ago

What will most likely happen when a warmer air mass exists above a polar ice sheet?

Andre45 [30]

I believe it is "The temperature of the ice sheet will be lowered" because it will most likely lower just a bit due to the heat. It's not going to fully melt but it will lower just a bit.
Plus I like your profile pic.

8 0

3 years ago

Read 2 more answers

A teacher reacts 84.0 g of sodium bicarbonate with excess hydrochloric acid. What is the percent yield for sodium chloride if 56

Bond [772]

Answer:

b

Explanation:

5 0

3 years ago

Imagine you are given a mystery element. It is, however, a discovered and known element. You may perform a maximum of two observ

3241004551 [841]

None, many elements share these properties

3 0

4 years ago