The missing coefficients that will balance the equation will be 4, 5, 4, and 6 respectively
Balancing equationsThe reaction between ammonia and oxygen can be represented by the following balanced equation:
[tex]4NH_3(g)+5O_2(g)----- > 4NO(g)+6H_2O(l)[/tex]
Thus, the coefficient for [tex]NH_3[/tex] would be 4, that of [tex]O_2[/tex] would be 5, that of NO would be 4, and that of [tex]H_2O[/tex] would be 6 respectively.
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Find the mass of sodium required to reduce 6.58 L of hydrogen gas at 32°C and 895 mm, when sodium reacts with hydrochloric acid. (Hint: you first need to write a balanced chemical equation.)
Answer:
Mass = 14.72 g
Explanation:
Given data:
Volume of hydrogen = 6.58 L
Temperature of gas = 32°C (32+273 = 305 k)
Pressure of gas = 895 mmHg (895/760 = 1.2 atm)
Mass of sodium required = ?
Solution:
Chemical equation:
2HCl + 2Na → 2NaCl + H₂
Number of moles of hydrogen:
PV = nRT
1.2 atm × 6.58 L = n× 0.0821 atm.L/mol.K×305 K
7.9 atm.L = n× 25.0 atm.L/mol
n = 7.9 atm.L / 25.0 atm.L/mol
n = 0.32 mol
Now we will compare the moles of hydrogen with sodium.
H₂ : Na
1 : 2
0.32 : 2/1×0.32 = 0.64 mol
Mass of sodium:
Mass = number of moles × molar mass
Mass = 0.64 mol × 23 g/mol
Mass = 14.72 g
True or false
The number of protons in an atom is called the atomic mass.
Why do the voices sound different when you listen to them through the wall?
Sound waves travel at different speeds when traveling through different
materials
Sound waves change frequency over long distances
Sound waves do not pass through solid materials
Your ear processes sound differently when it goes through a solid.
Answer:
Sound waves travel at different speeds when traveling through different materials
Explanation:
This is because in water the particles are more closely packed together, therefore making the sound travel faster and sound louder. The opposite is the same for air.
