1. Use correct significant figures a) During one laboratory we have worked with

Question

1. Use correct significant figures

a) During one laboratory we have worked with AgNO3 0.5 M. How many atoms of silver have we in 0.1mL of this solution?

During one laboratory we have worked with AgNO3 0.5 M. How many moles of silver have we in 0.1mL of this solution?

b) During one laboratory we have worked with HNO3 6M. How many moles of nitrate have we in 0.1mL of this solution?

During one laboratory we have worked with HNO3 6M. How many moles of nitrate have we in 0.10mL of this solution?

c) During one laboratory we have worked with HNO3 6 M. How many moles of nitrate have we in 0.100mL of this solution?

During one laboratory we have worked with HNO3 6 M. How many moles of nitrate have we in 0.1000mL of this solution?

Explanation / Answer

a)

moles = 0.5 x 0.1 x 10^-3 = 5 x 10^-5 mol

1 mol --------------> 6.023 x 10^23 atoms

5 x 10^-5 mol -----------> ??

number of atoms = 3.0 x 10^19 atoms

moles = 5.0 x 10^-5 mol

b)

moles = 6 x 10^-4 mol

c) During one laboratory we have worked with HNO3 6 M. How many moles of nitrate have we in 0.100mL of this solution?

moles = 6 x 10^-4 mol

During one laboratory we have worked with HNO3 6 M. How many moles of nitrate have we in 0.1000mL of this solution?

moles = 6 x 10^-4 mol

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