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3 years ago

Scientists discover two new elements, element A and element X, and are able to determine their atomic mass.

1 answer:

8 0

Since element A has an atomic mass of 17 amu, the total mass of the 2 A atoms in the molecule = 2 * 17 amu = 34 amu.
Similarly the total mass of the 3 X atoms is = 3 * 76 amu = 228 amu.
Therefore the total molar mass of the compound = 262 g/mol.

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A certain flexible weather balloon contains 7.4 L of helium gas. Initially, the balloon is in WP at 8500ft, where the temperatur

Free_Kalibri [48]

<h2>The new volume of the balloon at the top of Pikes Peak is 10.2 L</h2>

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

$\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}$

where,

$P_1$ = initial pressure of gas = 577.0 torr

$P_2$ = final pressure of gas = 400 torr

$V_1$ = initial volume of gas = 7.4 L

$V_2$ = final volume of gas = ?

$T_1$ = initial temperature of gas = $20.6^oC=273+20.6=293.6K$

$T_2$ = final temperature of gas = $7.5^oC=273+7.5=280.5K$

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

$\frac{577.0\times 7.4}{293.6K}=\frac{400.0\times V_2}{280.5K}$

$V_2=10.2L$

Thus the new volume of the balloon at the top of Pikes Peak is 10.2 L

Learn more about combined gas law

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3 0

3 years ago

In the third period of the periodic table sodium is followed by magnesium aluminum silicon and phosphorus which of these element

wariber [46]

Answer:
Phosphorous has the smallest atomic size.

Explanation:
As we know these elements belong to same period means there valence shell is the same. So moving from left to right along the period the shell number remains constant but the number of protons and electrons increases. So, due to increase in number of protons the nuclear charge increases hence attracts the valence electrons more effectively resulting in the decrease of atomic size.

Elements and their atomic radius are as follow,

Magnesium 0.160 nm

Aluminium 0.130 nm

Silicon 0.118 nm

Phosphorus 0.110 nm

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4 years ago

Determine the charge on the unknown ion, X, in the compound Nax.

Leviafan [203]

Answer:

wax i think

Explanation:

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2 years ago

On the window sill is a potted plant. The plant always seems to lean toward the window. Even though you turn its pot around ever

ICE Princess25 [194]

Answer:

because im trynna get these 5 points

Explanation:

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3 years ago

How many meters are in one kilometer

saul85 [17]

there are 1000 meters in one km

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3 years ago

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