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3 years ago

Define the "half-life" of a radioisotope

1 answer:

8 0

The amount of time it takes for 1/2 of it to decay or dissapear

this is liike compound interest because it takes the same amount of time to decay 1/2 of it, regardless of the amount

example

lets say half life of element x is 1 year
if yo has 32 grams, after 1 year, it decays to 16g
2 years decays to 8
3 years decays to 4
4 years decays to 2
5 years decays to 1
etc

hope this helps (I'm not the best at chem)

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How do greenhouse gases affect temperatures on Earth?

Feliz [49]

=>. the function of greenhouse gases are

=>. it captures the heat comming out from the

sun

=>. by capturing the heat it makes our earth

warm

=> if excess of heat will traped by them then

our earth become more warm and this leads

to increase in temperature

=> when the overall temperature will increase

then the ice sheets on pole will melts

and this leads to increase in sea level

=> then the land near water will sinks in water

3 0

3 years ago

How many grams of aluminum phosphate is produced from 7.5 g of lithium phosphate in this balanced equation? 2Li3PO4 + Al2(SO4)3

iren [92.7K]

7.8049856 g of aluminium phosphate is produced from 7.5 g of lithium phosphate in this balanced equation.

<h3>What are moles?</h3>

A mole is defined as 6.02214076 × $10^{23}$ of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Given data:

$2Li_3PO_4 + Al_2(SO_4)_3$ → $3Li_2SO_4 + 2AlPO_4$

Moles of 7.5 g of lithium phosphate.

The molar mass of lithium phosphate is 115.79 g/mol.

Moles = $\frac{mass}{molar \;mass}$

Moles = $\frac{7.5 g}{115.79 g/mol}$

Moles = 0.06477243285

Now we will compare the moles of $AlPO_4$ with $Li_3PO_4$ .

$Li_3PO_4$ : $AlPO_4$

2 : 2

0.385 : 2÷2× 0.064 = 0.064 mol

Mass of $AlPO_4$ :

Mass of $AlPO_4$ = moles × molar mass

Mass of $AlPO_4$ =0.064 mol × 121.9529 g/mol

Mass of $AlPO_4$ = 7.8049856 g

Hence, 7.8049856 g of aluminium phosphate is produced from 7.5 g of lithium phosphate in this balanced equation.

Learn more about moles here:

brainly.com/question/8455949

#SPJ1

4 0

2 years ago

A sealed container of nitrogen gas is at 1000.0 kPa pressure and at a temperature of 20.00 °C. The container is left in the sun,

vodka [1.7K]

Answer:

P₂ = 1102 Kpa

Explanation:

Given data:

Initial pressure = 1000.0 Kpa

Initial temperature = 20.0°C

Final temperature = 50.0°C

Final pressure = ?

Solution:

Initial temperature = 20.0°C (20+273 = 293 K)

Final temperature = 50.0°C (50+273 = 323 K)

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

1000 Kpa / 293 K = P₂/323 K

P₂ = 1000 Kpa × 323 K / 293 K

P₂ = 323000 Kpa. K /293 K

P₂ = 1102 Kpa

7 0

3 years ago

Consider the reaction for the combustion of benzene: 2 C6H6(g) 15 O2(g) ---> 12 CO2(g) 6 H2O(l) What mass of H2O is produced

irakobra [83]

Answer: Mass of water produced is 17.3 grams

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For benzene:

Given mass of benzene = 25.0 g

Molar mass of benzene= 78 g/mol

Putting values in equation 1, we get:

$\text{Moles of benzene}=\frac{25.0g}{78g/mol}=0.32mol$

The chemical equation for the reaction follows:

$2C_6H_6(g)+15O_2(g)\rightarrow 12CO_2(g)+6H_2O(l)$

As, oxygen is an excess reagent. Thus benzene is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

2 moles of benzene produces 6 moles of water

So, 0.32 moles of benzene will produce = $\frac{6}{2}\times 0.32=0.96moles$ of water

Now, calculating the mass of water from equation 1, we get:

Molar mass of water= 18 g/mol

Moles of water = 0.96moles

Putting values in equation 1, we get:

$0.96mol=\frac{\text{Mass of water}}{18g/mol}\\\\\text{Mass of water}=17.3g$

Thus mass of water produced is 17.3 grams

3 0

3 years ago

Need help on 8 plz some one

alexdok [17]

Well according to study.com," Subsidence can lead to the formation of a sedimentary rock because it forms basins or depressions where deposition can occur..." Here's the link for more info:
https://study.com/academy/answer/how-can-subsidence-lead-to-the-formation-of-sedimentary-rock.html

4 0

3 years ago

Read 2 more answers