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3 years ago

Which periodic group has the smallest atomic radius ?

Chemistry

2 answers:

inn [45]3 years ago

7 0

Answer:

Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.

Explanation:

Andrei [34K]3 years ago

3 0

Nobel gasses o think

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At 373.15K and 1 atm, the molar volume of liquid water and steamare 1.88 X 10-5 m3 and 3.06 X 10-2m3, respectively. Given that t

professor190 [17]

Answer The value of $\Delta H$ and $\Delta U$ is, 40.79 kJ and 37.7 kJ respectively.

Explanation :

Heat released at constant pressure is known as enthalpy.

The formula used for change in enthalpy of the gas is:

$\Delta Q_p=\Delta H=40.79kJ/mol$

Now we have to calculate the work done.

Formula used :

$w=-P\Delta V\\\\w=-P\times (V_2-V_1)$

where,

w = work done = ?

P = external pressure of the gas = 1 atm

$V_1$ = initial volume = $1.88\times 10^{-5}m^3=1.88\times 10^{-5}\times 10^3L=1.88\times 10^{-2}L$

$V_2$ = final volume = $3.06\times 10^{-2}m^3=3.06\times 10^{-2}\times 10^3L=3.06\times 10^{1}L$

Now put all the given values in the above formula, we get:

$w=-(1atm)\times (3.06\times 10^{1}-1.88\times 10^{-2})L$

$w=-30.5812L.atm=-30.5812\times 101.3J=-3097.87556J=-3.09\times 10^3J=-3.09kJ$

Now we have to calculate the change in internal energy.

$\Delta U=q+w$

$\Delta U=40.79kJ+(3.09kJ)$

$\Delta U=37.7kJ$

Thus, the value of $\Delta H$ and $\Delta U$ is, 40.79 kJ and 37.7 kJ respectively.

4 0

3 years ago

What is a possible benefit of having the Food and Drug Administration (FDA) test a new drug instead of having the drug manufactu

Alex

The FDA would have better authority i guess than the manufacturer and it would be safer for the FDA to test it out. Hope it helps

8 0

3 years ago

Read 2 more answers

If 12 gallons of gasoline cost $34.68, what is the unit price per gallon?

chubhunter [2.5K]

The answer is $2.89.

Since it’s asking for the unit price of one gallon and you have the total ($34.68 and 12 gallons), you would divide $34.68 from 12, which gives you $2.89.

34.68/12 = 2.89

5 0

2 years ago

A certain chemical reaction releases 36.2 kJ/g of heat for each gram of reactant consumed. How can you calculate what mass of re

Lilit [14]

Answer:

0.038 g of reactant

Explanation:

Data given:

Heat release for each gram of reactant consumption = 36.2 kJ/g

mass of reactant that release 1360 J of heat = ?

Solution:

As 36.2 kJ of heat release per gram of reactant consumption so first we will convert KJ to J

As we know

1 KJ = 1000 J

36.2 kJ = 36.2 x 1000 = 36200 J

So it means that in chemical reaction 36200 J of heat release for each gram of reactant consumed so how much mass of reactant will be consumed if 1360 J heat will release

Apply unity formula

36200 J of heat release ≅ 1 gram of reactant

1360 J of heat release ≅ X gram of reactant

Do cross multiplication

X gram of reactant = 1 g x 1360 J / 36200 J

X gram of reactant = 0.038 g

So 0.038 g of reactant will produce 1360 J of heat.

5 0

3 years ago

What is a possible cause of a large percentage of error in an experiment where mgo is produced from the combustion of magnesium?

PilotLPTM [1.2K]

A possible cause of a large percentage of error in an experiment where MgO is produced from the combustion of magnesium would be not all of the Mg has completely reacted. <span>

I hope this helps and if you have any further questions, please don’t hesitate to ask again. </span>

4 0

3 years ago

Read 2 more answers