A student adds 4.00 g of dry ice to an empty balloon. What will be the volume of the balloon at
25°C and 1 atm of pressure after all of the dry ice sublimes?

V= 2.45 L

Explanation:

Given data:

Volume of balloon = ?

Temperature = 25 °C (25+273 = 298 K)

Pressure of gas = 1 atm

Mass of ice = 4.00 g

Solution:

Formula:

PV = nRT

P = Pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

Number of moles:

Number of moles = mass/molar mass

Number of moles = 4.00 g/ 44 g/mol

Number of moles = 0.1 mol

Now we will put the values:

Ideal gas constant = R = 0.0821 atm.L/mol.K

PV = nRT

V = nRT/P

V = 0.1 mol × 0.0821 atm.L/mol.K × 298 K / 1 atm

V = 2.45 L

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.