Determine the numbers of atoms in each of the following 5.40 g b 0.250 mol k 0.0384 mol k 0.02550 g pt 1.00 x 10^-10 g au,

a) 5.40 g B : atoms

b) 0.250 mol K : atoms

c) 0.0384 mol K : atoms

d) 0.02550 g Pt: atoms

e)   Au: atoms

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number of particles.

To calculate the moles, we use the equation:

a) 5.40 g B

1 mole of boron contains = atoms

Thus 0.5 moles  of boron contain = atoms

b) 0.250 mol K

1 mole of potassium (K) contains = atoms

Thus 0.250 moles of potassium contain = atoms

c) 0.0384 mol K

1 mole of potassium (K) contains = atoms

Thus 0.0384 moles of potassium (K) contain = atoms

d) 0.02550 g Pt

1 mole of platinum contains = atoms

Thus of platinum contain= atoms

e) Au,

1 mole of gold contains = atoms

Thus of platinum contain= atoms

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.