How many atoms of gold are in a gold nugget with a mass of 4.25g

What is a metal replacement reaction

He table below gives the atomic mass and relative abundance values for the three isotopes of element m. relative abundance (%) atomic mass (amu) 78.99 23.9850 10.00 24.9858 11.01 25.9826 what is the average atomic mass (in amu) of element m? 2.86 5.36 24.30 24.98

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2