If 3.75 moles of aluminum react, how many moles of sulfur are needed? 16 Al + 3S8 --> 8Al2S3
0.70 mol

0.050 mol

20 mol

16 mol

What is the specific heat of a substance that absorbs 2.5×10^3 joules of heat when a sample of 1.0 ×10^4g of the substance increases in temperature from 10°c to 70°c?

The answer for #3 is c but i don't know why

Choose all the answers that apply. as ocean depth increases, temperature decreases temperature increases pressure increases pressure decreases salinity increases density increases