(1) Suppose you lift a stone that has a mass of 5.3 kilograms off the floor onto a shelf that is 1.5 meters high. How much work have you done

77.91 J

Explanation:

From the question given above, the following data were obtained:

Mass of object (m) = 5.3 kg

Height (h) = 1.5 m

Workdone =?

The Workdone can be obtained by using the following formula:

Workdone = mgh

Where the acceleration due to gravity (g) = 9.8 m/s²

Workdone = 5.3 × 9.8 × 1.5

Workdone = 77.91 J

Therefore, the Workdone in lifting the stone to a shelf that is 1.5 m is 77.91 J

  1.the balanced   chemical equation is as below

cu +   2 ag(no)₃ → cu(no₃)₂   +2 ag

2.the   much silver   produced   is   50.9 g

step 1: find the   moles of cu

moles =   mass÷   molar mass

  from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236   moles

step 2: use the mole ratio to determine the   moles of ag

from equation above   cu: ag   is 1: 2

therefore the moles of ag   =0.236   moles   x 2/1 =0.472   moles

step 3: find the mass   of ag

mass = moles x molar mass

from periodic table   the molar mass of ag =107.87 g/mol

mass   = 0.472   moles x 107.87 g/mol = 50.9 g

3.   the   much   silver   collected worth is   1.797 oz

  convert   50.9 g   to oz

that is   1 gram = 0.0353 oz

          50.9 grams =?   oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1   gram}   =1.797 oz

heat the gas and measure the pressure