⇒ only atom consist of 1 electron and one proton
Rest atoms greater than 1 atomic number (neutral) have neutrons,electrons and protons.
The density of water is about 1kg/m³, therefore is the substance has a density of less than 1kg/m³ then it will most likely float however if it is more than 1kg/m³ then it will most likely sink.
Explanation:
The given data is as follows.
50 ml of
, 50 ml of 
And, it is known that at STP 1 mole of a gas occupies 22.4 L. Hence, moles present in 50 ml of gas are as follows.
(As 1 L = 1000 ml)
=
moles
So, according to the given equation
moles of
reacts with
moles of
.
Hence, moles of
is equal to the moles of
and
.
Therefore, moles of
=
moles
1 mole of
= 22.4 L
moles =
= 50 ml of product
Thus, we can conclude that 50 ml of products if pressure and temperature are kept constant.
The best and most correct answer among the choices provided by your question is the third choice or letter C "a low heat capacity because a small amount of thermal energy will cause a large increase in temperature.<span> "
Heat capacity is </span><span>the number of heat units needed to raise the temperature of a body by one degree.</span>
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4.2 grams i think i hope this helps