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3 years ago

Radioactive isotopes of an atom are

Chemistry

2 answers:

nikdorinn [45]3 years ago

5 0

Less stable should be the answer.as I think
I hope this helps you

Virty [35]3 years ago

4 0

Answer:b/ less stable

Explanation:

Many elements that have one or more isotopes which are radioactive in nature have the nucleus which remains in an unstable state. The unstable nucleus breaks down, decay and emit the radiation. The nucleus in the atoms of these elements are unstable because it consists of unstable ratio of protons to neutron.

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Calculate the number of grams of Fe that are produced when 57 grams of FeO is reacted with excess aluminum in the following reac

Dafna11 [192]

Answer:

Mass of Fe produced = 44.7 g

Explanation:

Given data:

Mass of Fe produced in gram = ?

Mass of FeO react = 57 g

Solution:

Chemical equation:

2Al + 3FeO → 3Fe + Al₂O₃

Number of moles of FeO:

Number of moles = mass/ molar mass

Number of moles = 57 g/ 71.844 g/mol

Number of moles = 0.8 mol

Now we will compare the moles of Fe with FeO from balance chemical equation.

FeO : Fe

3 : 3

0.8 : 0.8

Mass of Fe:

Mass = Mass × molar mass

Mass = 0.8 mol × 55.845 g/mol

Mass = 44.7 g

6 0

3 years ago

A sample of neon occupies a volume of 752 ml at 25 0

lyudmila [28]

$V_{initial} = 752\:mL$
$T_{initial} = 25.0^0C$
converting to Kelvin
TK = TC + 273
TK = 25.0 + 273 → TK = 298.0 → $T_{initial} = 298.0\:K$
$V_{final} = ? (in\:milliliters)$
$T_{final} = 50.0^0C$
TK = TC + 273
TK = 50.0 + 273 → TK = 323.0 → $T_{final} = 323.0\:K$

By the first Law of Charles and Gay-Lussac, we have:
$\frac{ V_{i} }{ T_{i} } = \frac{ V_{f} }{ T_{f} }$

Solving:
$\frac{ V_{i} }{ T_{i} } = \frac{ V_{f} }{ T_{f} }$
$\frac{ 752 }{ 298.0 } = \frac{ V_{f} }{ 323.0 }$
Product of extremes equals product of means:
$298.0* V_{f} = 752*323.0$
$298.0 V_{f} = 242896$
$V_{f} = \frac{242896}{298.0}$
$\boxed{\boxed{V_{f} \approx 815.08\:mL}}\end{array}}\qquad\quad\checkmark$

5 0

3 years ago

How would one go about solving this?? Thank you.

Marta_Voda [28]

Answer:

5.66g/ml

Explanation:

Mass of Metal Slug, m = 25.17g

Volume of container (flask), v = 59.7ml

Mass of Methanol, M = 43.7g with density, d = 0.791g/ml

Therefore,

Volume of Methanol = M/d = 43.7 / 0.791 = 55.25ml

Volume of Metal slug in the flask = v - V = 59.7 - 55.25 = 4.45ml

Density of Metal slug = mass of metal slug / volume of metal slug

= 25.17 / 4.45 = 5.66g/ml

7 0

3 years ago

Write, Balance and Label the type of reaction: Potassium Hydroxide plus phosphoric acid yields potassium phosphate and water.

natali 33 [55]

In order to balance this, you have to count each element where the elements in the reactants side and the product side should have equal number of molecules. The balanced reaction is as follows:

KOH + H3PO4 = KH2PO4 +H2O

7 0

3 years ago

What is 0.738 × 104? Enter your answer in the box.<br> _____

lisov135 [29]

The answer would be 76.752 .

4 0

2 years ago