A sample of a compound contains 30.0 g C and 5.05 g H. Its molar mass is 78.12 g/mol. What is the compound’s molecular formula?
1 answer:
The relative atomic mass of C is 12 g. So, to calculate how many atoms of C there are, we will divide 30 g by 12 g:
30 g ÷ 12 g = 2.5
The relative atomic mass of H is 1 g. So, to calculate how many atoms of C there are, we will divide 5.05 g by 1 g:
5.05 g ÷ 1 g = 5.05 ≈ 5
Now, let's calculate the ratio of C and H atoms:
This means there are 2 H atoms more than C atoms and therefore, <span>the compound’s molecular formula is CH</span>₂.
30 g ÷ 12 g = 2.5
The relative atomic mass of H is 1 g. So, to calculate how many atoms of C there are, we will divide 5.05 g by 1 g:
5.05 g ÷ 1 g = 5.05 ≈ 5
Now, let's calculate the ratio of C and H atoms:
This means there are 2 H atoms more than C atoms and therefore, <span>the compound’s molecular formula is CH</span>₂.
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Answer:
Final temperature =
Explanation:
Given that,
Heat added, Q = 250 J
Mass, m = 30 g
Initial temperature, T₁ = 22°C
The Specific heat of Cu= 0.387 J/g °C
We know that, heat added due to the change in temperature is given by :
Put all the values,
So, the final temperature is equal to .