Answer:
Hi, There!
<em>Archimedes and Isaac newton both used to explain their observations
</em>
<em>
D)scientific law Is the Correct Answer! ^^</em>
<em></em>
<em>Hope this helps!</em>
D = g / cm³
Density = mass / volume
D = 360 g / 7.5 cm³
D = 48 g/cm³
answer D
hope this helps!
Answer:
% Fe= 63.9
Explanation:
The amount of iron that was titrated can be calculated as follows:
mol K₂Cr₂O₇ = 0.02120 L x 0.180 M = 3.82 x 10⁻³
mol Fe titrated = 3.78 mol Cr₂O₇²⁻ x 10⁻³ x 6 mol Fe²⁺/mol Cr₂O₇²⁻
= 2.29 x 10⁻²
mass Fe = 2.29 x 10⁻² mol Fe²⁺ x 55.845 g/mol Fe²⁺ = 1.28 g Fe
% Fe = 1.28 g Fe / 2.00 g steel x 100 g steel = 63.9 %
<span>1.
</span>The balanced reaction is:<span>
Mg (s) + 2HCl (aq)
--> MgCl 2 (aq) + H 2 (g)
We
are given the amount hydrochloric acid to be used for the reaction. This will
be the starting point of the calculation.
40.0 g
HCl ( 1 mol HCl / 36.46 g HCl)
(1 mol H2 / 2 mol HCl) (2.02 g H2 / 1 mol H2) = 1.11 g H2</span>