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3 years ago

Sort these molecules according to their polarity.

Chemistry

1 answer:

Alex3 years ago

5 0

Answer:

Polar molecules- NH3, HBr

Nonpolar molecules- CO2, BF3, H2, CH4

Explanation:

NH3 is polar because the three N-H bonds are in non symmetrical trigonal pyramidal arrangement, hence there is a resultant dipole moment that makes the molecule polar. The electro negativity difference between hydrogen and bromine makes HBr a polar molecule.

CO2 and BF3 are non polar because the individual dipoles in the molecule cancels out. CH4 is composed of two atoms of almost similar electro negativities hence it is non polar. H2 is contains a homonuclear covalent bond hence the molecule is nonpolar.

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3 years ago

0.28gram of NH3 on decomposition gave 0.25gram of nitrogen and hydrogen. Find the volume of hydrogen evolved at Ntp. (2gram hydr

hodyreva [135]

The volume of H₂ evolved at NTP=0.336 L

<h3>Further explanation</h3>

Reaction

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2NH₃ ⇒ N₂ + 3H₂

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0.28 NH₃= 0.25 N₂ + 0.03 H₂

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so for 0.03 g :

$\tt \dfrac{0.03}{2}\times 22.4=0.336$

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3 years ago

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4 years ago

Which of these planets has the coldest surface temperature?

lianna [129]

Neptune planet has the coldest surface temperature

Explanation:

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4 years ago

Read 2 more answers

Problem Page Suppose 25.1g of barium nitrate is dissolved in 200.mL of a 0.50 M aqueous solution of ammonium sulfate. Calculate

melomori [17]

Answer:

1.26 M

Explanation:

The ion nitrate is NO₃⁻ and the Barium is from group 2 so it forms the ion Ba²⁺, so the barium nitrate has the formula: Ba(NO₃)₂. The molar masses are: Ba: 137 g/mol, N = 14 g/mol, O = 16 g/mol, so the molar mass of barium nitrate is:

137 + 2x(14 + 3x16) = 199 g/mol

The number of moles is the mass divided by the molar mass, so:

n = 25.1/199 = 0.126 mol of Ba(NO₃)₂

In 1 mol of the salt, there are 2 moles of NO₃⁻, so the number of moles of nitrate is 0.252 mol. Nitrates formed with ammonium (that can react when the solid dissolves) and with elements from group 1 and 2 are completely soluble in water. So, the moles of nitrate will remain 0.252 mol.

The molarity is the number of moles divided by the volume (0.2 L):

[NO₃⁻]= 0.252/0.2 = 1.26 M

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3 years ago