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Licemer1 [7]
3 years ago
10

What is the bond angle between the hydrogen atoms in an ammonia (NH₃) molecule?

Chemistry
1 answer:
dimulka [17.4K]3 years ago
3 0
There are 4 electron pairs (3 bonding and 1 lone pair) so the angle is 107 degrees. The 4 electron pairs are repelled to give a tetrahedral arrangement but the molecule has a pyrimidal shape due to the lone pair.
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Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas
Zinaida [17]

Answer: Number of molecules of hydrogen gas 6.32\times 10^{32}

Explanation:

2Na+2H_2O\rightarrow 2NaOH+H_2

Number of moles of sodium =\frac{\text{mass of sodium}}{\text{molar mass of sodium}}=\frac{48.7 g}{23 g/mol}=2.11mol

According to reaction , 2 moles of sodium produces 1 mole of hydrogen gas , then 2.11 mol of sodium will= \frac{1}{2}\times 2.11 mol of hydrogen gas that is 1.05 moles of hydrogen gas.

Number of molecules = N_A(\text{Avogadro number})\times moles of substance

Moles of hydrogen gas formed = 1.05 moles

Number of molecules of hydrogen gas = N_A\times moles of hydrogen gas

Number of molecules of hydrogen gas =6.022\times 10^{23} mole^{-1}\times 1.05 mole=6.32\times 10^{32}

8 0
2 years ago
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Schach [20]

Answer:

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Explanation:

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8 0
3 years ago
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alekssr [168]

Answer:

Waves involve the transport of energy without the transport of matter. In conclusion, a wave can be described as a disturbance that travels through a medium, transporting energy from one location (its source) to another location without transporting matter.

Explanation:

hope this helps, I tried to give an easy definition  :)

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2 years ago
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Karo-lina-s [1.5K]
<span>We know that protons gives positive charge, neutrons no charge and electrons negative, then +14 - 12 = +2 So the charge of the atom is sign positive and magnitude 2</span>
7 0
3 years ago
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