I tried to answer this but forgot answer gg
Answer:
of heat energy will be released
Explanation:
Balanced reaction-
According to balanced equation, moles of produces 1 mol of to release 46.17 kJ of heat.
Molar mass of = 2.016 g/mol
Number of moles = (mass)/(molar mass)
So, 28 kg of = 28000 g of
= moles of
= moles of
So. moles of react to release heat or of heat
Answer : (C) Hafnium is the most likely identity of the given substance.
Solution : Given,
Mass of given substance (m) = 46.9 g
Volume of given substance (V) = 3.5
First, find the Density of given substance.
Formula used :
Now,put all the values in this formula, we get
= 13.4 g/
So, we conclude that the density of given substance (13.4 g/) is approximately equal to the density of Mercury and Hafnium (13.53 and 13.31 g/ respectively).
According to the question the substance is solid at room temperature but Mercury is liquid at room temperature. So, Mercury is not identical to the given substance.
Another element i.e, Hafnium is the element whose density is approximately equal to the given substance and also solid at room temperature. And we know that the melting point of solid is high.
So, Hafnium is the most likely element which is the identity of the given substance.
Sorry for the first answer you received, that is incredibly inappropriate. I searched several resources and I’m pretty sure that your answer is D. 2 valence electrons.
Answer:
It would take sound <em><u>104.998 seconds</u></em> to travel across lake tahoe.
Explanation:
First let's convert the miles to meters, so, 21.6 miles = 34754.4 meters
Now, we will divide this number in meters by 331. So, 34754.4 / 331 = 104.998
And what will the unit be? Seconds will be the unit for time here so 104.998 seconds.