Concrete has a specific heat capacity of 3.3 J/(g *oC). How much energy is necessary to heat up 2,000 g of concrete from 25oC to 55oC?

Explanation:

We want to find energy and we are given the specific heat capacity, mass, and change in temperature. We must use this formula:

where m is mass, c is the heat capacity, and ΔT is the change in temperature.

We know the mass is 2,000 grams, the heat capacity is 3.3 J/g °C.

To find the change in temperature, subtract the final temperature and initial temperature.

ΔT= final temp. - initial temp. ΔT= 55°C -25°C ΔT= 30°C

Substitute the known values into the formula.

Multiply the first two numbers and note the grams will cancel out.

Multiply again. This time, the degrees Celsius will cancel.

198,000 Joules of energy are required.

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic