Answer:
c
Explanation:
because the sun is at the center of the universe the planet orbit the sun its basically a simple answer so if you need more help im right here
Answer:
pH change is -0.07
Explanation:
Using H-H equation for acetic acid:
pH = pKa + log [Acetate salt] / [Acetic acid]
Replacing:
pH = 4.74 + log[1.188M] / [1.188M]
pH = 4.74
The HCl reacts with sodium acetate producing acetic acid, thus:
HCl + CH₃COONa → CH₃COOH + NaCl
That means the final moles of sodium acetate are initial moles - moles of HCl and moles of acetic acid are initial moles + moles of HCl.
As the volume of the buffer is 1.0L, initial moles of both substances are 1.188moles. After reaction, the moles are:
sodium acetate: 1.188mol - 0.1mol = 1.088mol
Acetic acid: 1.188mol + 0.1mol = 1.288mol
Using again H-H equation:
pH = 4.74 + log[1.088M] / [1.288M]
pH = 4.67
pH change is: 4.67 - 4.74 = -0.07
1 x 10^28 this what the <span>scientific notation</span>
Brass is an alloy, or a combination of two (or more) metals.
Answer:
14.45g
Explanation:
We have a balanced equation:
3H2(g) + N2(g) → 2NH3(g)
We know the mass H2 = 2.55g
We can work out the moles of H2 - Mass = mr x moles
Moles = mass/ mr = 2.55/ 2 = 51/40
Using the ratios in the question, this is 3:2
51/40 /2 x 3 = 17/20
so there are 17/20 moles NH3
Mass = mr x moles = 17/20 x 17 = 289/20 = 14.45g
Hope this helps! Let me know if you have any questions :)
