Question

How many Coulombs of negative charge are carried by the electrons in a 340 ml cup of coffee? density is 1.0 g/ml, the molecular mass of water is 18 g/mole, and there are 10 electrons per water molecule.

Answer #1

About how many Coulombs of negative charge are carried by the
electrons in a 301 ml cup of coffee? Assume the coffee is basically
water, so the density is 1.0 g/ml, the molecular mass of water is
18 g/mole, and there are 10 electrons per water molecule.

Part A.) What is the total negative charge, in
coulombs, of all the electrons in a small 1.15 g sphere of carbon?
One mole of C is 12.0 g , and each atom contains 6 protons and 6
electrons. Express your answer using three significant figures.
Part B.) Suppose you could take out all the
electrons and hold them in one hand, while in the other hand you
hold what is left of the original sphere. If you hold your...

Water has a mass per mole of 18.0 g/mol, and each water molecule
(H2O) has 10 electrons. (a) How many electrons are there in 6.21
liters of water? (1 liter is equivalent to 1.00 × 10-3 m3) (b) What
is the net charge of all these electrons?

Water has a mass per mole of 18.0 g/mol, and each water molecule
(H2O) has 10 electrons. (a) How many electrons are there in 2.82
liters of water? (1 liter is equivalent to 1.00 × 10-3 m3) (b) What
is the net charge of all these electrons?

Water has a mass per mole of 18.0 g/mol, and each water molecule
(H2O) has 10 electrons. (a) How many
electrons are there in 3.35 liters of water? (1 liter is equivalent
to 1.00 × 10-3 m3) (b) What
is the net charge of all these electrons?
For (a) the answer is 1.12E27. How do you find (b)?

a) Calculate the number of electrons in a small, electrically
neutral silver pin that has a mass of 6.3 g. Silver has 47
electrons per atom, and its molar mass is 107.87 g/mole.
b) Imagine adding electrons to the pin until the negative charge
has the very large value 1.10mC. How many electrons are added for
every 10^9 electrons already present?

how
many coulombs of positive charge are there in 1.10kg of plutonium,
given its atomic mass is 244 and that each plutomium atom has 94
protons?

How many mL of cream at 5 degrees with a density of
1.35g/ml must be mixed with 180ml of coffee at 95degrees so that
the resulting combinations will have a temperature of 80degres? the
specific heat of cream is 3.25j/g C. assume the density of water is
1g/ml

1. How many moles are in 9.6 mL of acetic anhydride, density of
1.082? Give two significant figures. Given molecular weight: 102
g
2. As a "rule of thumb" there are 20 drops of a liquid in a mL.
Using this estimate and a density of 1.685, how many moles are in 9
drops of 85 % by weight phosphoric acid? Give two significant
digits. Given molecular weight: 98 g
3. Starting with 9.6 g of salicylic acid, how many...

When 30.5 mL of 0.515 M H2SO4 is added to 30.5 mL of 1.03 M KOH
in a coffee-cup calorimeter at 23.50°C, the temperature rises to
30.17°C. Calculate H of this reaction per mole of H2SO4 and KOH
reacted. (Assume that the total volume is the sum of the individual
volumes and that the density and specific heat capacity of the
solution are the same as for pure water: d = 1.00 g/mL and c =
4.184 J/g×K.)

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