In which model are atoms are imagined as tiny balls?

What is the mass of a sample of NH3 containing 7.20 x 10^24 molecules of NH3?

leva [86]

Answer:203

Explanation: just have to timez

4 0

3 years ago

The seafloor and continental land are similar in age true or false

EastWind [94]

false my dude......;;;;;;;;;;;;;;;[[[[[[

7 0

3 years ago

I In a smaller room, such as a bathroom, the reflected sound can reverberate (echo in many directions) off the smooth tile. Why

AVprozaik [17]

Answer:

See explanation

Explanation:

It is common knowledge that quite a number of people enjoy singing in the shower. There are reasons for this!

In the shower, there are many surfaces that reflect the sound of your voice as you sing. That makes your voice to sound more powerful and have more volume.

The reverberation of the sound makes the sound of your voice stronger and more intense altogether enriching the music produced as you sing.

5 0

3 years ago

A solution of HNO3HNO3 is standardized by reaction with pure sodium carbonate. 2H++Na2CO3⟶2Na++H2O+CO2 2H++Na2CO3⟶2Na++H2O+CO2 A

Gemiola [76]

Answer:

(0,653±0,002) M of HNO₃

Explanation:

The reaction of standarization of HNO₃ with Na₂CO₃ is:

2 HNO₃ + Na₂CO₃ ⇒ 2 Na⁺ + H₂O + CO₂ + 2NO₃⁻

To obtain molarity of HNO₃ we need to know both moles and volume of this acid. The volume is (27,71±0,05) mL and to calculate the moles it is necessary to obtain the Na₂CO₃ moles and then convert these to HNO₃ moles, thus:

0,9585 g of Na₂CO₃ × ( 1 mole / 105,988 g) =

9,043×10⁻³ mol Na₂CO₃ × ( 2 moles of HNO₃ / 1 mole of Na₂CO₃) = 1,809×10⁻² moles of HNO₃

Molarity is moles divide liters, thus, molarity of HNO₃ is:

1,809×10⁻² moles / 0,02771 L = 0,6527 M of HNO₃

The absolute uncertainty of multiplication is the sum of relative uncertainty, thus:

ΔM = 0,6527M× (0,0007/0,9585 + 0,001/105,988 + 0,05/27,71) =

0,6527 M× 2,54×10⁻³ = 1,7×10⁻³ M

Thus, molarity of HNO₃ solution and its absolute uncertainty is:

(0,653±0,002) M of HNO₃

I hope it helps!

5 0

3 years ago

A chemist is using a solution of hno3 that has a ph of 3.75. what is [h ] for the solution?

kap26 [50]

A chemist is using a solution of HNO₃ that has a pH of 3.75. what is [H⁺] for the solution is 1.7 × 10⁻⁴M.

<h3>How do we calculate the [H⁺]?</h3>

Concentration of H⁺ ion will be calculated by using the below equation of pH as:

pH = -log[H⁺]

or [H⁺] = $10^{-pH}$

Given that, pH = 3.75

So concentration of H⁺ ion will be calculated as:

[H⁺] = $10^{-3.75}$

[H⁺] = 1.7 × 10⁻⁴M

Hence concentration of H⁺ ion is 1.7 × 10⁻⁴M.

To know more about pH & [H⁺], visit the below link:
brainly.com/question/8758541

4 0

2 years ago