Can anyone help me with my one question on my stuff?
Answer:
The half-life of Th-232 is 1.4 ∙ 10¹⁰ years.
a. Elemental percent composition is the mass percent of each element in the compound.
The formula for mass elemental percent composition = 
(1)
The molecular formula of cisplatin is 
.
The atomic weight of the elements in cisplatin is:
Platinum, 
Nitrogen, 
Hydrogen, 
Chlorine, 
The molar mass of = 
= 
The mass of each element calculated using formula (1):
- Platinum, 
%
%.
- Nitrogen, 
%
%
- Hydrogen, 
%
%
- Chlorine, 
%
%
b. The given reaction of cisplatin is:
According to the balanced reaction, 1 mole of 
gives 1 mole of .
Now, calculating the number of moles of in 100.0 g.
Number of moles = 
Molar mass of = 
Number of moles of = 
.
Since, 1 mole of gives 1 mole of . Therefore, mass of cisplatin is:
For mass of 
:
Molar mass of = 
Since, 1 mole of gives 2 mole of . Therefore, mass of is:
Answer: C. 1000 Newton
Explanation:
Given that :
Weight of moon rover on earth = 6000 newton
Approximate of moon rover on moon will be?
Weight of an object (W) = mass(m) × acceleration due to gravity(g)
To get the mass of moon rover(m) :
m = weight / acceleration due to gravity
g on earth = 9.8m/s²
Hence,
mass of moon rover = 6000/ 9.8
= 612.244kg
Surface gravity on the moon is about 1.6m/s²
Hence ;
Weight of moon rover on the moon :
Mass of moon rover × 1.6m/s²
= 612.244 × 1.6m/s²
= 979.59 Newton
= 1000 Newton (nearest thousand)
From the chemical equation given:
H2SO4+2KOH--->K2SO4+2H2O
the two reactants, H2SO4 and KOH, are in 1:2 stoichiometric ratio.
No. of moles of KOH = 2* no. of moles of H2SO4
=2*0.1*0.033
The concentration of KOH = no. of moles / volume
=2*0.1*0.033/0.05
=0.132M
