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2 years ago

Which planet is the most heavily cratered of the terrestrial planets

Chemistry

2 answers:

Anvisha [2.4K]2 years ago

5 0

Earth is the planes most of the terrestrial planet

snow_lady [41]2 years ago

4 0

I think it is Earth, because Earth is the only one that contains terrestrials.

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A student placed 0.0243 g of magnesium in 50 mL of 0.200 molar HCl solution, producing H2 gas according to the following reactio

V125BC [204]

Answer:

Volume of hydrogen gas = 0.1539dm3

Explanation:

Equation of the reaction

Mg(s) + 2HCl --> MgCl2(aq) + H2(g)

Molar concentration of HCl = 0.2mol/dm3

Mass of magnesium = 0.0243g

Volume of HCl = 0.05dm3

No of moles of HCl = Volume * molar concentration

= 0.05 * 0.5

= 0.01mol

No of moles of Magnesium = mass/molecular weight

Molecular weight of Magnesium = 24g/mol

No of moles of magnesium = 0.0243/24

= 0.001013mol

Using stoichiometry,

Since 1 mole of Magnesium metal reacted with 2 moles of HCl acid

HCl is the limiting reagent.

Therefore, 1 mole of hydrogen gas is given off.

0.005 mole of hydrogen is given off.

Using ideal gas law, PV = nRT

Volume = (0.005 * 0.0821 * 300)/0.8

= 0.1539dm3

8 0

3 years ago

An empirical formula:__________ 1. gives the relative number of ions of each element per formula unit. 2. gives the number of io

crimeas [40]

Answer:

4. gives the relative number of atoms of each element per formula unit

Explanation:

An empirical formula -

It refers to the formula which determined the simplest whole - number ratio of all the atoms in a given species , is referred to as an empirical formula .

In simple terms ,

It is he smallest formula of the whole number which when multiplied by some whole number gives the actual structure of the compound .

Hence , from the given information of the question ,

The correct option for empirical formula is 4.

8 0

3 years ago

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in which n

wolverine [178]

<u>Answer:</u> The wavelength of light is $3.97\times 10^2nm$

<u>Explanation:</u>

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

$\frac{1}{\lambda}=R_H\left(\frac{1}{n_i^2}-\frac{1}{n_f^2} \right )$

Where,

$\lambda$ = Wavelength of radiation

$R_H$ = Rydberg's Constant = $1.097\times 10^7m^{-1}$

$n_f$ = Higher energy level = 7

$n_i$ = Lower energy level = 2

Putting the values in above equation, we get:

$\frac{1}{\lambda }=1.097\times 10^7m^{-1}\left(\frac{1}{2^2}-\frac{1}{7^2} \right )\\\\\lambda =\frac{1}{0.2518\times 10^7m^{-1}}=3.97\times 10^{-7}m$