You have two water samples.
sample x has a volume of 750 ml and a temperature of 42◦c.
sample y has a volume of 380 ml and a temperature of 42◦c.
which sample contains the most heat?

1.) sample y
2.) both samples contain the same amount of heat.
3.) sample x
4.) cannot determine from information given.

Explanation:

In thermodynamics, the heat content of heat of a system or a substance is described by the term enthalpy.

The heat content (enthalpy) is an extensive property, meaning that it is dependent on the amount of substance.

More substance more heat energy content.

Heat content is also related with the temperature. The higher the temperature the greater the kinetic energy and the higher the heat content.

Since, sample X and sample Y are both at the same temperature of 42°C, this variable does not differentiate the heat content of such samples.

Since, the sample X has more volume than sample Y, as per the previous conclusion that the more substance the more heat energy, you can certainly asses that the former contains the most heat.

electron microscopy and scanning tunneling microscopes gives us a greater understanding of atoms by being able to see the atom itself, and lets us see some atomic reactions.

explanation:

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2