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3 years ago

U-236 spontaneously decays to Br-87, X and three neutrons. What is element “X”? 1. Th 2. Pb 3. Ra 4. La 5. Ba

1 answer:

Elena-2011 [213]3 years ago

6 0

<span>U-236 spontaneously decays to Br-87, X and three neutrons. The element X is 4. La, also known as Lanthanum, number 57 in the periodic system of elements.</span>

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At the seashore young children often play comfortably in shallow water while older people Are shivering in deeper water just a f

Svetradugi [14.3K]

At the sea shore there is less water so the sun shines directly in them, deeper. there is more water. so their bodies are more in the water therefore the sun is less in their bodies.

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3 years ago

How many moles are in 1.9 x 1046 atoms of chromium?

faust18 [17]

Answer:

<h2>3.156 × 10²² atoms</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

$n = \frac{N}{L} \\$

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

$n = \frac{1.9 \times {10}^{46} }{6.02 \times {10}^{23} } \\ = 3.156 \times {10}^{22}$

We have the final answer as

<h3>3.156 × 10²² atoms</h3>

Hope this helps you

8 0

3 years ago

What is the formula for calcium chloride?<br><br><br> Ca2Cl<br><br> CaCl<br><br> CaCl2<br><br> CaCl3

djyliett [7]

<em>Hello there, and thank you for asking your question here on brainly.

The answer to this is Answer choice C: CaCl2

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8 0

3 years ago

Read 2 more answers

What were the units of light energy emitted by blackbody radiation originally called?

Dafna11 [192]

The units of light energy emitted by blackbody radiation is originally called as quanta. Black body radiation is a type of radiation within a boy in thermodynamic equilibrium. This is a theoretical body. In 1900, Planck proposed that light and other electromagnetic waves were emitted in discrete packets of energy which were called "quanta". This was the original unit used.

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4 years ago

The chemical reaction in this example is of environmental interest. Iron pyrite (Fesz) is often an impurity in

enot [183]

178.87 grams of sulphur dioxide is formed according to the equation given.

Explanation:

The balanced chemical reaction for the process is:

4 FeS2 + 11 O2 ⇒ 2Fe2O3(-) + 8 SO2

the reaction involving FeS and oxygen having balanced chemical equation as:

moles of oxygen given as 3.84

so when 11 moles of O2 reacts to form 8 moles SO2

3.84 moles of oxygen reacts to form x moles of SO2

$\frac{8}{11}$ = $\frac{x}{3.84}$

x = $\frac{30.72}{11}$

2.792 moles of sulphur dioxide will be formed

The mass can be calculated as number of moles x molar mass of 1 mole of SO2

= 2.792 x 64.066

= 178.87 grams of sulphur dioxide is formed.

7 0

3 years ago