Answer:
Are u a boy or a girl so we can form a study group and the answer is C
Answer:
1.61 x 10²⁰ molecules
Explanation:
Given parameters:
Mass of the hydrogen gas = 8.01 x 10⁻⁴g
Unknown
Number of molecules of NH₃ = ?
Solution:
Given reaction:
N₂ + 3H₂ → 2NH₃
We have to solve from the known to the unknown
- The known specie is the mass of H₂ ;
find the number of moles of the specie;
number of moles = 
Molar mass of H₂ = 2(1) = 2g/mol
Number of moles =
= 0.0004mol
- 3 moles of H₂ will produce 2 moles of NH₃
0.0004 moles of H₂ will produce
= 0.00027moles of NH₃
1 mole of a substance contains 6.02 x 10²³ molecules
0.00027mole of NH₃ will contain 0.00027 x 6.02 x 10²³
= 1.61 x 10²⁰ molecules
Answer: 0.84 g
Explanation:

Given: moles of iron = 0.015
Molar mass of iron = 56 g/mol

Thus 0.84 g of iron participated in the chemical reaction.
Answer : 69.44 mL
Explanation : Here we can use the formula as

Where we have the value of

= 0.0887 M

= 0.0224 M and

= 275 mL
So, substituting the above values in the given equation we get,
0.0887 X x = 275 X 0.0224
Therefore, x = 69.44 mL
So it will require 69.44 mL.
Answer:
Molecular formula = N2O4
Explanation:
The empirical formula of a compound is NO2. Its molecular mass is 92g/mol. What is its molecular formula?
Step 1: Data given
The empirical formula = NO2
The molecular formula = NO2
Molar mass N = 14 g/mol
Molar mass O = 16 g/mol
Step 2: Calculate molecular mass of the empirical formula
Molar mass NO2 = molar mass N + Molar mass of 2*O
Molar mass NO2 = 14 + 2*16
Molar mass = 46 g/mol
Step 3: Calculate the molecular formula
We have to multiply the empirical formula by n
n = molecular mass / molecular mass of the empirical formula
n = 92 g/mol / 46 g/mol
n = 2
We have to multiply the empirical formula by 2
Molecular formula = 2*(NO2)
Molecular formula = N2O4