Answer:
2.07 Kcal heat must be added to completely melt the platinum.
Explanation:
Given data:
Molar heat of fusion = 4.700 Kcal / mol
Mass of platinum = 85.5 g
Heat of fusion = ?
Solution:
Formula:
ΔH = n × molar heat of fusion
n = number of moles
Now we will calculate the number of moles:
Number of moles = mass / molar mass
Number of moles = 85.5 g /195.08 g/mol
Number of moles = 0.44 mole
ΔH = n × molar heat of fusion
ΔH = 0.44 mol × 4.700 Kcal / mol
ΔH = 2.07 Kcal
Answer:
D ≈ 4.86 g/mL
Explanation:
Density = Mass over Volume
D = m/V
Step 1: Define variables
m = 13.76 g
V = 2.83 mL
D = unknown
Step 2: Substitute and Evaluate for Density
D = 13.76 g/2.83 mL
D = 4.8621908127208480565371024734982 g/mL
Step 3: Simplify
We are given 3 sig figs.
4.8621908127208480565371024734982 g/mL ≈ 4.86 g/mL
Answer:
Explanation:
= Density of acetic acid = 
= Mass of acetic acid = 
= Volume
Density is given by
The volume of acetic acid is .
Answer : The order of potential energy from least to greatest is,
(3) < (1) < (4) < (2)
Explanation :
Formula used :
where,
P.E = potential energy
m = mass of an object
g = gravity constant = 
h = height
Now we have to calculate the potential energy of following options.
(1) Tiles a 15-kilogram stone found at a height of 3 meters.
(2) 10 kilograms of water stored at a height of 9 meters.
(3) 1-kilogram ball located 20 meters.
(4) In the area box of books weighing 25 kilograms placed on a shelf 2 meters high.
From this we conclude that, the order of potential energy from least to greatest is,
(3) < (1) < (4) < (2)
Answer:
poor access to health care providers
Explanation:
without health care providers you cant get tested.
