Answer:
41.9 g
Explanation:
We can calculate the heat released by the water and the heat absorbed by the steel rod using the following expression.
Q = c × m × ΔT
where,
c: specific heat capacity
m: mass
ΔT: change in temperature
If we consider the density of water is 1.00 g/mol, the mass of water is 125 g.
According to the law of conservation of energy, the sum of the heat released by the water (Qw) and the heat absorbed by the steel (Qs) is zero.
Qw + Qs = 0
Qw = -Qs
cw × mw × ΔTw = -cs × ms × ΔTs
(4.18 J/g.°C) × 125 g × (21.30°C-22.00°C) = -(0.452J/g.°C) × ms × (21.30°C-2.00°C)
ms = 41.9 g
 
        
             
        
        
        
Answer:
 17.83M
Explanation:
Given parameters: 
Mass of KCO₂ = 1.5kg 
Volume of water  = 850mL 
Unknown: 
Molarity of solution  = ? 
Solution: 
Molarity is defined as the number of moles per unit volume. It is the number of moles of solute in a given volume of solution. 
    Molarity  = 
 Number of moles of solute  = 
   Molar mass of KCO₂  = 39 + 12 + 3(16) = 99g/mol
   Number of moles  =  = 15.15moles
   = 15.15moles 
    850mL : gives 0.85L
       
Molarity  =  = 17.83M
   = 17.83M
 
        
             
        
        
        
Answer:
Scientific knowledge involves human inference, imagination, and creativity. Despite having an empirical basis of scientific knowledge, it involves scientist's imagination and creativity
 
        
                    
             
        
        
        
germanium  has 32 protons in its nucleus