When hydrogen peroxide decomposes, what mass of
hydrogen peroxide is needed
in solution to produce 1.6 g of
oxygen gas?

The Molar mass of Oxygen is 32 g/mol

Therefore moles of Oxygen = 1.6/32 =0.05

2 H2O2 = 2 H2O + O2

So, 2 x 0.05 = 0.1 moles of peroxide are needed.

The molar mass of peroxide is 34 g/mol

Mass = moles x Mr = 0.1 x 34 = 3.4g

Although in reality the yield is unlikely to be 100% so a better answer would be “more than 3.4g”

african americans demonstrated their newly found freedom by relocating often in search of relatives whom they had been separated from during slavery. others established schools to educate freed people and they built institutions such as churches and political organizations to advocate for their rights.

the answer is definitely c.