Explanation:
clinical laboratory test results are a very important parameter in diagnosis, monitoring and screening. 70-80 ... it is possible to determine whether you can interpret the test result as being ...
Answer:
464.1 J absorbed.
Explanation:
Given data:
Specific heat of zinc = 0.39 J/g°C
Mass of zinc = 34 g
Temperature changes = 22°C to 57°C
Energy absorbed or released = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 57°C - 22°C
ΔT = 35°C
Q = m.c. ΔT
Q = 34 g. 0.39 J/g°C. 35°C
Q = 464.1 J
Answer:
D. 450 J/kgK
Explanation:
Using the formula as follows:
Q = m × c × ∆T
Where:
Q = amount of heat absorbed/released (J)
m = mass of substance (g)
c = specific heat capacity
∆T = change in temperature (°C)
According to the information provided in this question:
Q = 267.3 kJ = 267300J
m = 18kg
∆T = 318K - 285K = 33K
c = ?
Q = m × c × ∆T
c = Q ÷ m∆T
c = 267300 ÷ 18 × 33
c = 267300 ÷ 594
c = 450 J/kgK
The charges in the finger are attracted by the charges in the doorknob because charges that are the same repel each other. Charges that are different attract each other. The electric field is pulled toward the other charged object if their charges are different.
When the molar mass M = mass (g)/ no.of moles (Mol)
∴ moles= 0.271 g / M
By using the gas equation:
PV = n RT
when P is the pressure = 847 mmHg / 760 = 1.11 atm
V is the volume = 0.294 L
n = 0.271 / M
R is constant = 0.0821
T= 140+273 = 413 K
so by substitution:
when n = PV/RT
∴ 0.271/ M = 1.11 atm *0.294 L/ 0.0821 *413
∴ M = 28
when the empirical formula of CH2 = 12+2 = 14
∴ the exact no.of moles = 28/14 = 2
∴the molecular formula = 2(CH2) = C2H4
