Answer: the mass number is 51.9961 u.
Explanation: Basically your looking for the mass number of a ATOM of chromium now if you where looking for chromium and not the atom it's self it would be a different number which is 52-54
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Answer:
4590 joules
Explanation:
First of all, you need to know the specific heat (C) of the isopropyl alcohol which has the value of 3 kJ /kg°C.
This is an easy calorimetry problem. The formula is Q = m . C . ΔT.
Where m is the mass of compound and ΔT the difference of T°
ΔT = Final T° - Initial T°
Let's replace data, and firstly, we convert the mass of alcohol from g to kg, because the units of the Specific heat
25 g . 1kg /1000g = 0.025kg
Q = 0.025 kg . 3 kJ/kg°C (82.4°C - 21.2°C)
Q = 4.59 kJ
If we want the value in joules, we make the conversion:
4.59 kJ . 1000 J/ kJ = 4590 J
Answer:
A. The vinegar and baking soda released a gas. Hope it helps. :)