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3 years ago

Which of the following is the correct formula for barium (II) sulfate?

Chemistry

2 answers:

nasty-shy [4]3 years ago

5 0

BaSO4 is the correct formula for barium (ll) sulfate

balu736 [363]3 years ago

4 0

BaSO4 is the correct formula for barium (ll) sulfate

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. A 500.0 mL buffer solution contains 0.30 M acetic acid (CH3COOH) and 0.20 M sodium acetate (CH3COONa). What will the pH of thi

julia-pushkina [17]

Answer:

pH = 4.57

Explanation:

pH = pKa + log ([OAc⁺]/[HOAc])

Ka(HOAc) 1.8 x 10⁻⁵ => pKa = -log(1.8 x 10⁻⁵) = 4.74

[OAc⁻] = 0.20M

[HOAc] = 0.30M

pH = 4.74 + log([0.20]/[0.30]) = 4.47 + (-0.17) = 4.57

7 0

3 years ago

What is the mass number of an isotope

makkiz [27]

<span>The mass number given on the periodic table is a weighted average of all the isotopes. You get the exact mass of an isotope by adding the protons(atomic number) to the number of neutrons in that isotope.</span>

8 0

3 years ago

Read 2 more answers

Question 23 (1 point)

Sedbober [7]

Answer:

d = 1.53 g/mL

Object will sink into water

Explanation:

Given data:

Mass of object = 14.8 g

Initial volume of water = 25.0 mL

Final volume after adding object = 34.7 mL

Density of object = ?

Density of water = 1.00 g/mL

Solution:

Volume of object = Total volume - volume of water

Volume of object = 34.7 mL - 25.0 mL

Volume of object = 9.7 mL

Density of object;

d = mass/volume

d = 14.8 g / 9.7 mL

d = 1.53 g/mL

The density of water is 1.00 g/mL which means object is heavier than water thus object will sink into the water. The object with density less than water are float in it.

7 0

3 years ago

Three isotopes of oxygen are oxygen-16 oxygen-17 and oxygen-18. Write the symbol for each, including the atomic number and mass

Karo-lina-s [1.5K]

The symbol of an isotope is:
$^A _Z X$
A - the mass number
Z - the atomic number
X - the symbol of an element

The symbol of oxygen is O.

The atomic number is the same for all isotopes of one element. For oxygen it's 8, because every atom of oxygen has 8 protons in its nucleus.

The mass number is the number of nucleons (protons + neutrons) in the nucleus of an atom, and it's given in the name of an isotope. Oxygen-16 has the mass number 16, oxygen-17 has the mass number 17, oxygen-18 has the mass number 18.

Oxygen-16: $^{16} _8 O$

Oxygen-17: $^{17} _8 O$

Oxygen-18: $^{18} _8 O$

5 0

3 years ago

If you begin with 32.0 grams of oxygen and all of the hydrogen that you need, how many grams of water can you make?

gtnhenbr [62]

You can make 2 grams of water. There is one mole of oxygen in water and one mole of oxygen is 16g. 32 divided by 16 is 2.

8 0

3 years ago