Fill in the coefficient needed to make the equation balanced. 1. Na + Cl2 → NaCl

a. 2, 2
b. 2, 3
c. 2, 1
d. 2, 4

2. Al + S → Al2S3

a. 2, 2
b. 2, 3
c. 2, 4
d. 2, 6

3. H2 + O2 → H2O

A. 2, 2
b. 2, 3
c. 2, 4
d. 2, 8

4. Fe + O2 → Fe2O3

a. 4, 2, 2
b. 4, 2, 1
c. 4, 3, 2
d. 4, 3, 1

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit

Achemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore