A piece of lead takes up a space of 6.92 mL and has a density of 11.4g/mL. Calculate the mass

The answer to your question is 78.89 g

Explanation:

Data

Volume = 6.92 ml

Density = 11.4 g/ml

mass = ?

Density is the relation between the mass and the volume of a body and is a specific property of matter.

Formula

Density = mass / volume

Solve for mass

Mass = density x volume

Substitution

Mass = 11.4 x 6.92

Simplification

Mass = 78.89 g

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g

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