An isotopically enriched silicon sample is (27.98 amu) and (28.98 amu) by number of atoms

CHEMISTRY · Subjective · A Level · Chemistry · Atomic structure · Atomic structure

Problem

An isotopically enriched silicon sample is

92.2\,\%

^{28}\text{Si}

(27.98 amu) and

7.8\,\%

^{29}\text{Si}

(28.98 amu) by number of atoms. If the sample contains exactly

3.00\times10^{22}

silicon atoms, calculate its mass in grams. Provide your answer to three significant figures.