What is the molecular weight of 170 g of lead (II) nitrite?

Explanation:

Molecular weight is the mass of substance containing 1 Avogadro's Number of particles which is 6.023 x 10²³ particles. Such  is calculated by adding the formula weights of all elements in the compound of interest. For Pb(NO₃)₂ the molecular weight is 1Pb + 2N + 6O = 1(207g/mol) + 2(14g/mol) + 6(16g/mol) = 331g/mol.

For the problem, it is asking for the number of moles Pb(NO₃)₂ in the given mass of 170g of the substance. Such is calculated by dividing the given mass (170g) by molecular weight (331g/mol).

moles of Pb(NO₃)₂ in 170g = given mass (170g)/molecular weight (331g/mol) = 0.51 mole of Pb(NO₃)₂.

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the answer is minerals.