Speed = Distance / Time
s = 10 / 2
s = 5 Km/h
In short, Your Answer would be 5 Km/h
Hope this helps!
Answer:
545.2
Explanation:
To read a beam balance, you need to add together the numbers that each balance reads.
The first beam reads 500.
The second beam reads 40.
The third beam reads 5.2.
500 + 40 + 5.2 = 545.2
The total mass of the rock sample is 545.2.
This problem is about conversion and dimensional analysis. Important information to know:
1 atm = 760 torr = 101.325 kPa
For atm to torr conversion:
0.875 atm * (760 torr / 1 atm) = 665 torr
For atm to kPa conversion:
0.875 atm * (101.325 kPa / atm) = 88.7 kPa
Thus the answer is b) 665 torr and 88.7 kPa
The volume of the 0.15 M LiOH solution required to react with 50 mL of 0.4 M HCOOH to the equivalence point is 133.3 mL
<h3>Balanced equation </h3>
HCOOH + LiOH —> HCOOLi + H₂O
From the balanced equation above,
The mole ratio of the acid, HCOOH (nA) = 1
The mole ratio of the base, LiOH (nB) = 1
<h3>How to determine the volume of LiOH </h3>
- Molarity of acid, HCOOH (Ma) = 0.4 M
- Volume of acid, HCOOH (Va) = 50 mL
- Molarity of base, LiOH (Mb) = 0.15 M
- Volume of base, LiOH (Vb) =?
MaVa / MbVb = nA / nB
(0.4 × 50) / (0.15 × Vb) = 1
20 / (0.15 × Vb) = 1
Cross multiply
0.15 × Vb = 20
Divide both side by 0.15
Vb = 20 / 0.15
Vb = 133.3 mL
Thus, the volume of the LiOH solution needed is 133.3 mL
Learn more about titration:
brainly.com/question/14356286
Answer:
Protons = 89
Neutrons = 142
Electrons = 89
Option C
Explanation:
Hello,
Were required to find the proton, neutron and electron of an element Y
The atomic mass of element Y is composed of the protons and neutrons while the atomic number is the exact amount of protons present in the element.
Element = ₈₉²³¹Y
Atomic number = 89
Number of protons = 89
Number of electrons = 89
Atomic mass = 231
Atomic mass = protons + neutrons
231 = 89 + neutrons
Neutrons = 231 - 89
Neutrons = 142
Therefore the number of protons is 89, number of neutrons is 142 and number of electrons is 89.
Note: for an electrically neutral atom, the number of protons must be equal to the number of electrons
