Which set of chemical name and chemical formula for the same compound is correct?

a) ammonium sulfite (nh4)2s

b) iron(lll) phosphate, fepo4

c) lithium carbonate, lico3

d) magnesium dichromate, mgcro4

Can someone me with 1 to 4 plz. fast

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

Fill in the blanks for the following statements: the rms speed of the molecules in a sample of h2 gas at 300 k will be times larger than the rms speed of o2 molecules at the same temperature, and the ratio µrms (h2) / µrms (o2) with increasing temperature. a not enough information is given to answer this question b sixteen, will not change c four, will not change d four, will increase e sixteen, will decrease