homework 6.4

1. How many atoms are in 3 mol$mol$ of atoms? Express your answer using four significant figures.

2.How many molecules are in 6 m$ol$ of molecules?

Express your answer using four significant figures.

3. Calculate the mass in grams of each sample.

A. 7.02×10²⁰H2O molecules

Express your answer using three significant figures.

B.2.7×10²²SO2 molecules

Express your answer using two significant figures.

C.5.9×10²⁵O3 molecules

Express your answer using two significant figures.

D. 9.38×10¹⁹CH$4_{}$ molecules

Express your answer using three significant figures.

4. How many atoms are in each elemental sample?

A.2.7 mol $Cu$

$\mathrm{B.}$29.1 mol Hg$$

Express your answer using three significant figures.

Express your answer using two significant figures.