Answer: 16700 Joules
Explanation:
The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.
Q = Heat absorbed = ?
m = mass of sand = 2 kg
c = heat capacity = 
Initial temperature = 
= 
Final temperature= 
= 
Change in temperature ,
Putting in the values, we get:
16700 J of energy must be added to a 2-kilogram pile of it to increase its temperature from 40°C to 50°C
Answer:
34.6 cm³
Explanation:
<em>A chemistry student needs 55.0 g of carbon tetrachloride for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of carbon tetrachloride is 1.59 g/cm³. Calculate the volume of carbon tetrachloride the student should pour out. Be sure your answer has the correct number of significant digits.</em>
Step 1: Given data
- Mass of carbon tetrachloride (m): 55.0 g
- Density of carbon tetrachloride (ρ): 1.59 g/cm³
Step 2: Calculate the required volume of carbon tetrachloride
Density is an intrinsic property of matter. It can be calculated as the quotient between the mass of the sample and its volume.
ρ = m/V
V = m/ρ
V = 55.0 g/(1.59 g/cm³)
V = 34.6 cm³
The chemistry student should pour 34.6 cm³ of carbon tetrachloride.
Complete Question:
A chemist adds 55.0 mL of a 1.1M barium acetate (Ba(C2H3O2)2) solution to a reaction flask. Calculate the mass in grams of barium acetate the chemist has added to the flask. Round your answer to 2 significant digits.
Answer:
15 g
Explanation:
The concentration of the barium acetate is given in mol/L (M), thus, the number of moles (n) of it is the concentrantion multiplied by the volume (55.0 mL = 0.055 L):
n = 1.1 * 0.055
n = 0.0605 mol
The molar mass of the substance can be calculated by the sum of the molar mass of each element, which can be found at the periodic table. Thus:
Ba = 137.33 g/mol
C = 12.00 g/mol
H = 1.00 g/mol
O = 16.00 g/mol
Ba(C2H3O2)2 = 137.33 + 4*12 + 6*1 + 4*16 = 255.33 g/mol
The molar mass is the mass divided by the number of moles, thus the mass (m) is the molar mass multiplied by the number of moles.
m = 255.33 * 0.0605
m = 15.45 g
Rounded by 2 significant digits, m = 15 g.
Answer:
Venus has a very small axial tilt -- 3 degrees versus Earth's 23.5 degrees. Its dense, acidic atmosphere produces a runaway greenhouse effect that keeps the surface at around 865 degrees F year-round, which is hot enough to melt lead.When the solar system settled into its current layout about 4.5 billion years ago, Venus formed when gravity pulled swirling gas and dust together to form the second planet from the Sun. Like its fellow terrestrial planets, Venus has a central core, a rocky mantle and a solid crust.
Explanation:
i hope it's help you
Answer:
Explanation:
<u>1) Data:</u>
<u />
a) Acetic acid CH₃COOH
b) molar mass of CH₃COOH: 60.052 g/mol
c) %: = 5.00%
d) d = 1.006 g/ml
e) M = ?
<u>2) Formulae:</u>
a) M = n of solute / V of solution in liters
b) n = mass in grams / molar mass
c) % = (mass of solute / mass of solution)×100
d) d = mass / volume
<u>3) Solution:</u>
a)<u> Assume a basis </u>
b) <u>Calculate the mass of that basis (1 liter of solution)</u>
- d = mass / V ⇒ mass = d × V
- mass = 1.006 g/ml × 1 liter × 1,000 ml/liter = 1006 g
c) <u>Calculate the mass of solute</u>
<u />
- % = (mass of solute / mass of solution ) × 100 ⇒
mass of solute = % × mass of solution / 100 = 5.00% × 1,006 g / 100
mass of solute = 50.3 g
d) <u>Calculate the number of moles of solute</u>
<u />
- n = mass in grams / molar mass = 50.3 g / 60.052 g/mol = 0.838 mol
e) <u>Calculate molarity</u>
- M = n / V in liter = 0.838 mol / 1 liter = 0.838 M ← answer
