Number of proton K=19
so, 42 - 19 =23
then the answer in 19 protons and 23 neutrons
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Answer:
To find how many feet their are in 58 yards, you have to multiply 58 yards by 3, because their are 3 ft per yard.
Explanation:
58 * 3 = ?
58 * 3 = 174 feet
Your answer is 174 feet.
I hope this helps!
Answer:
carbon
Explanation:
because it is an allotrope of carbon
The question is incomplete.
You need two additional data:
1) the original volume
2) what solution you added to change the volume.
This is a molarity problem, so remember molarity definition and formula:
M = n / V in liters: number of moles per liter of solution
To give you the key to answer this kind of questions, supppose the original volumen was 1 ml and that you added only water (solvent).
The original solution was:
V= 1 ml
M = 0.2 M
Using the formula for molarity, M = n / V
n = M×V = 0.2 M × (1 / 10000)l = 0.0002 moles
For the final solution:
n = 0.0002 moles
M = 0.04
From M = n / V ⇒ V = n / M = 0.002 moles / 0.04 M = 0.05 l
Change to ml ⇒ 0.05 l × 1000 ml / l = 50 ml. This would be the answer for the hypothetical problem that I assumed for you.
I hope this gives you all the cues you need to answer similar problems about molarity.
