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3 years ago

Relative mass of MgCl2Full explanation Mine answer is coming 59.7

Chemistry

1 answer:

timofeeve [1]3 years ago

5 0

Answer:

Ar(Mg)=24g

Ar(Cl)=35,5 and Cl2=35,5×2=71g

m=24g+71g=95g

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Uranium-238 decays to lead-206 with a half-life of 4.5 x 109 yr. Determine how much uranium-238 decays in milligrams (to three s

Mamont248 [21]

Answer:

2.15 mg of uranium-238 decays

Explanation:

For decay of radioactive nuclide-

$N=N_{0}.(\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}}$

where N is amount of radioactive nuclide after t time, $N_{0}$ is initial amount of radioactive nuclide and $t_{\frac{1}{2}}$ is half life of radioactive nuclide

Here $N_{0}=4.60 mg$ , $t=4.1\times 10^{9}yr$ and $t_{\frac{1}{2}}=4.5\times 10^{9}yr$

So, $N=(4.60mg)\times (\frac{1}{2})^{\frac{4.1\times 10^{9}}{4.5\times 10^{9}}}$

so, N = 2.446 mg

mass of uranium-238 decays = (4.60-2.446) mg = 2.15 mg

3 0

3 years ago

Which describes an atom with an atomic number of nine

jonny [76]

Answer:

Fluorine

Explanation:

fluorine is the element in question, as its atomic number is 9

4 0

3 years ago

Assume an object A mass of 36.240 g and it’s density is 5.40 g/mL. What is it’s volume

topjm [15]

The volume of the object=6.71ml

Given:

Mass of the object=36.240g

Density of the object=5.40 $\frac{g}{m l}$

To find:

Volume of the object

<u>Step by Step Explanation:</u>

Solution:

According to the formula, Density of the object is given as

$\rho=\frac{m}{v}$ and from this volume can be derived as

$v=\frac{m}{\rho}$

Where, m=mass of the cylinder

$\rho$ =density of the cylinder

v=volume of the cylinder

We know the values of m=36.240g and $\rho$ =5.40 $\frac{g}{m l}$

Substitute these values in the above equation we get

$v=\frac{m}{\rho}$

v=36.240/5.40

=6.71ml

Result:

Thus the volume of the object is 6.71ml

5 0

3 years ago

Calculate the standard entropy change for the following reaction at 25 Ã‚Â°C. SÃ‚Â° values can be found here. mg(oh)2 + 2hcl

Olegator [25]

Given reaction:

Mg(OH)2(s) + 2HCl(g) → MgCl2(s) + 2H2O(g)

Formula:

ΔS°rxn = ∑nS°(products) - ∑nS°(reactants)

= [S°(MgCl2) + 2S°(H2O)] -[S°(Mg(OH)2 + 2S°(HCl)]

= [89.3+2(188.7)] - [63.22+2(186.80] = 29.88 J/K

Thus, the standard entropy change for the reaction is around 30 J/K

5 0

3 years ago

A scientist finds a fossil that contains a long beak. He can assume which of the following things?

stealth61 [152]

The animal most likely ate worms the lived underground

7 0

4 years ago

Relative mass of MgCl2Full explanation Mine answer is coming 59.7​

Relative mass of MgCl2Full explanation Mine answer is coming 59.7