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Mnenie [13.5K]
3 years ago
9

Half life in chemistry I wasn't here when we did this

Chemistry
1 answer:
tatuchka [14]3 years ago
6 0
A half-life is the amount of time it takes for half of a substance to decay.

1.) After one half-life - 13.5mg.
After two - 6.75mg
Three - 3.375mg

2.) 250mg of Iron-59 will remain.

3.) 14 days is the half-life of Phospherous-32.
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Ag + HCl --&gt; ?<br> a) No reaction<br> b) AgCl + H2<br> c) AgCl + H2O<br> PLEASE HELP
Volgvan

Answer:

AgCl + H2 - Chemical Equation Balancer.

8 0
3 years ago
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How many atoms make up a diatomic molecule?
zalisa [80]
The prefix 'di' means two. Hence two atoms make up a diatomic molecule.
Hope this helps!
6 0
3 years ago
A sample of TNT, C7H5N3O6 , has 8.94 × 1021 nitrogen atoms. How many hydrogen atoms are there in this sample of TNT?
Bess [88]

Answer:

1.49×10²² atoms of H are contained in the sample

Explanation:

TNT → C₇H₅N₃O₆

1 mol of this has 7 moles of C, 5 moles of H, 3 moles of N and 6 moles of O

Let's determine the mass of TNT.

Molar mass is = 227 g/mol

As 1 mol has (6.02×10²³) NA atoms, how many moles are 8.94×10²¹ atoms.

8.94×10²¹ atoms / NA = 0.0148 moles

So this would be the rule of three to determine the mass of TNT

3 moles of N are in 227 g of compound

0.0148 moles of N are contained in (0.0148 .227) / 3 = 1.12 g

Now we can work with the hydrogen.

227 grams of TNT contain 5 moles of H

1.12 grams of TNT would contain (1.12 .5) / 227 = 0.0247 moles

Finally let's convert this moles to atoms:

0.0247 mol . 6.02×10²³ atoms / 1 mol = 1.49×10²² atoms

8 0
3 years ago
Which is the correct formula for the compound made when aqueous solutions containing a dissolved magnesium compound and a dissol
jenyasd209 [6]
It would be MgCl₂ ~ Magnesium Chloride. 
4 0
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What is the nuclear equation for decay of Am - 241
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Americium is a radioactive element .

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The nuclear reaction.is given by

\rm {}^{241}_{95}Am\longrightarrow {}^{237}_{93}Np+{}^4_2\alpha

  • Np stands for Nuptunium

Here alpha can be written as He too

3 0
1 year ago
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