Expressed to the correct number of significant figures, the sum of two masses is 445.2 grams. Which two masses produce this answer? A) 210.10 g + 235.100 g

B) 210.100 g + 235.10 g

C) 210.1 g + 235.1 g

D) 210.10 g + 235.10 g

Which of the following mining methods disrupts the sea floor?

Look at the reaction below: ca(hco3)2 --> caco3 + co2 + h2o first, balance the reaction. once balanced, use dimensional analysis or another method to find out how many moles of carbon dioxide will be produced if we start with 16.5 moles of calcium bicarbonate (calcium hydrogen carbonate). = mol of co2 number needs to be reported to three significant figures.

There are 6.022 x 10^23 atoms of hg in 1 mole of hg. the number of atoms in 4.5 moles of hg can be found by multiplying 4.5 by 6.022 x 10^23 a. 2.7 x 10^24 b. 27 x 10^23 c. 2.71 x10^24 d. 27.099 x 10^23