What is the molerity of 4grams of sodium chloride in 3.800ml solution

Sodium hydroxide, NaOH; sodium phosphate, Na3PO4; and sodium nitrate, NaNO3, are all common chemicals used in cleanser formulati

Sholpan [36]

Start by writing out molar mass of each component:

1) NaOH= 22.99+16+1.01 --> 40

2) Na₃PO₄= (22.99)3 + 94.97 + 64 --> 227.94

3) NaNO₃= 22.99 + 14 + 48 --> 84.99

Now compare the mass of sodium with the rest of the substances:

1) (22.99/40)100%= 57.475%

2) (68.97/227.94)/100%= 30.25%

3) (22.99/84.99)/100%= 27.05%

As seen, the ordered list is: Sodium hydroxide, sodium phosphate and sodium nitrate.

Hope I helped :)

8 0

4 years ago

Compare the intermolecular forces, dipole-dipole and hydrogen-bonding. What would you suggest is the biggest different between t

Angelina_Jolie [31]

Both the dipole-dipole and hydrogen are essentially same because they result form formation of partial negative and positive charges on the atoms constituting a given molecule. in such molecule, one atom is more electronegative than the other and therefore pulls the shared electrons more to itself than the other atom. the atom that pulls a pair of electrons more to itself becomes partially negatively charged whereas the other atom becomes partially positively charge. the weak negative charges on one molecule attracts weak positive charge on the other molecule creating intermolecular forces referred to as dipole-dipole bonds. Hydrogen bonds form in the same manner they are stronger than typical dipole-dipole bonds. so according to the explanation above D is the correct answer.

6 0

3 years ago

Which statement best describes a physical change?

Inga [223]

Answer: 3 Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same

Explanation:

Physical change mainly physical properties of a substance while the chemical changes remain unchanged. Once there is a change to the chemistry of the substance, this would be classified as a chemical change.

8 0

3 years ago

Read 2 more answers

Which of the following elemental sequence represents an increase in atomic size?

xz_007 [3.2K]

Answer:

A) B, C, Na, AI, K

Explanation:

This is because from the periodic table, the atomic size of each element increases as we go along the periodic table.

The atomic numbers of the elements are B = 5, C = 6 , Na = 11, Al = 13 and K = 19.

The electronic configuration of each element is given as follows

B = 2, 3; C = 2, 4; Na = 2, 8, 1; Al = 2, 8, 3 and K = 2, 8, 8, 1

Since the atomic numbers increase from left to right as we go along the periodic table, their atomic sizes also increase.

Also, from their electronic configurations, Boron (B)and Carbon (C) only have electrons on the K and L shell. Sodium (Na) and Aluminium (Al) have electrons on the K, L and M shells while Potassium (K) has electrons on the K, L, M and N shells.

So, the larger the electronic configuration, the larger the atomic radius and thus atomic size.

So, they increase in the order B, C, Na, Al, K

3 0

3 years ago

9) Consider the reaction of C6H6 Br2 C6H5Br HBr a. What is the theoretical yield of C6H5Br if 42.1 g of C6H6 react with 73.0 g o

Lyrx [107]

Answer:

71.7 g of C₆H₅Br are produced at the theoretical yield.

Explanation:

The reaction is:

C₆H₆ + B₂ → C₆H₅Br + HBr

This is an easy excersie, stoichiometry is 1:1

We determine moles of reactants:

42.1 g / 78g/mol = 0.540 moles of benzene

73 g / 159.80 g/mol = 0.457 moles of hydrogen bromide

Certainly, the HBr is the limiting reactant, because I need 0.540 moles of HBr for 0.540 moles of benzene and I only have, 0.457 moles.

0.457 moles of HBr will produce 0.457 of bromobenzene, at the 100 % yield reaction (theoretical yield)

We convert the moles to mass: 0.457 g . 157 g/mol = 71.7 g

5 0

3 years ago