ok so when it comes to atoms there is the same amount for example the hydrogen atom has 1 proton 1 electron but no neutrons while the carbon atom has 6 protons 6 neutrons and 6 electrons so your answer would be b!
The answer is C. No all cells have cell walls. Prokaryotes don’t have a nucleus or chloroplast. Leaving C to be correct
Answer is: the molarity of the solution is 0.336 M.
m(Ca(NO₃)₂) = 127 g; mass of calcium nitrate.
n(Ca(NO₃)₂) = m(Ca(NO₃)₂) ÷ M(Ca(NO₃)₂).
n(Ca(NO₃)₂) = 127 g ÷ 164.1 g/mol.
n(Ca(NO₃)₂) = 0.77 mol; amount of calcium nitrate.
V(solution) = 2300 mL ÷ 1000 mL/L.
V(solution) = 2.3 L.
c(Ca(NO₃)₂) = n(Ca(NO₃)₂) ÷ V(solution).
c(Ca(NO₃)₂) = 0.77 mol ÷ 2.3 L.
c(Ca(NO₃)₂) = 0.336 mol/L; molarity of the solution.
The piece of unknown metal is in thermal equilibrium with water such that Q of metal is equal to Q of the water. We write this equality as follows:
-Qm = Qw
Mass of metal (Cm)(ΔT) = Mass of water (Cw) (ΔT)
where C is the specific heat capacities of the materials.
We calculate as follows:
-(Mass of metal (Cm)(ΔT)) = Mass of water (Cw) (ΔT)
-68.6 (Cm)(52.1 - 100) = 42 (4.184) (52.1 - 20)
Cm = 1.717 -----> OPTION C<span>
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4.98 x 10^3 would be 4980.