How many moles are in 47.5 g of Ca?
A.2.85 e 25
B.1.18 mol
C. 7.89 e-23
D.1900 mol

thats a little if u want the answer just look it up on google thats what i do haha : )

the answer is minerals.

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.