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3 years ago

9

Element X is a solid that is brittle, lacks luster,and has six valence electrons. In which group on the Periodic Table would ele

ment X be found

1 answer:

erastova [34]3 years ago

4 0

Answer:

Sulfur?

Explanation:

Sulfur has 6 valence electrons and does not have luster.

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What volume of 10,0 M H2SO4 is required to prepare 4.0 L of 0.50 M H2SO4?

Evgesh-ka [11]

Answer: A) 0.20 L

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

According to the neutralization law,

$M_1V_1=M_2V_2$

where,

$M_1$ = molarity of stock $H_2SO_4$ solution = 10.0 M

$V_1$ = volume of stock $H_2SO_4$ solution = ?

$M_2$ = molarity of dilute $H_2SO_4$ solution = 0.50 M

$V_2$ = volume of dilute $H_2SO_4$ solution = 4.0 L

$10.0\times V_1=0.50\times 4.0$

$V_1=0.20L$

Therefore, the volume of 10.0 M $H_2SO_4$ solution needed to prepare 4.0 L of 0.50 M $H_2SO_4$ is 0.20 L

8 0

3 years ago

A sample of oxygen has a volume of 128 milliliter at a pressure of 500.0 mmhg calculate the volume this sample would occupy at s

leva [86]

Answer:

84.2mL

Explanation:

The following data were obtained from the question:

Initial volume (V1) = 128mL

Initial pressure (P1) = 500mmHg

Final pressure (P2) = stp = 760mmHg

Final volume (V2) =..?

Thus, the new volume of the gas can be obtained by using the Boyle's law equation as follow:

P1V1 = P2V2

500 x 128 = 760 x V2

Divide both side by 760

V2 = (500 x 128)/760

V2 = 84.2mL

Therefore, the new volume of the gas is 84.2mL

4 0

3 years ago

What electrically neutral atom has 30 neutrons and 25 electrons?

Black_prince [1.1K]

Answer:

Manganese (Mn)

Explanation:

We know it's manganese because we are told it is an electrically neutral atom. This means it has the same number of protons and electrons. If it has 25 electrons, it has 25 protons. Protons tell us the atomic number of the atom, which also tells us the name of the element. Manganese is element 25 on the periodic table.

7 0

3 years ago

Why does the moon spin around the earth and the earth spins around the sun

liberstina [14]

This easy bro there is only one answer Gravity

but here my advance word

Sometimes the gravity of big objects would capture smaller ones in orbit. This could be one way the planet acquired the moon

7 0

3 years ago

If 45.0 mL of ethanol (density = 0.789 g/mL) initially at 8.0 ∘C is mixed with 45.0 mL of water (density = 1.0 g/mL) initially a

strojnjashka [21]

Answer : The final temperature of the mixture is, $22.14^oC$

Explanation :

First we have to calculate the mass of ethanol and water.

$\text{Mass of ethanol}=\text{Density of ethanol}\times \text{Volume of ethanol}=0.789g/mL\times 45.0mL=35.5g$

and,

$\text{Mass of water}=\text{Density of water}\times \text{Volume of water}=1.0g/mL\times 45.0mL=45.0g$

Now we have to calculate the final temperature of the mixture.

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

$q_1=-q_2$

$m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)$

where,

$c_1$ = specific heat of ethanol = $2.42J/g^oC$

$c_2$ = specific heat of water = $4.18J/g^oC$

$m_1$ = mass of ethanol = 35.5 g

$m_2$ = mass of water = 45.0 g

$T_f$ = final temperature of mixture = ?

$T_1$ = initial temperature of ethanol = $8.0^oC$

$T_2$ = initial temperature of water = $28.6^oC$

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

$35.5g\times 2.42J/g^oC\times (T_f-8.0)^oC=-45.0g\times 4.18J/g^oC\times (T_f-28.6)^oC$

$T_f=22.14^oC$

Therefore, the final temperature of the mixture is, $22.14^oC$

3 0

3 years ago