Answer:
206 kj of heat is required to boil 78.5 kg of water at its boiling point
Silver nitrate and magnesium chloride react according to the following equation:
2AgNO3(aq) + MgCl2(aq) — 2AgCl(s) + Mg(NO3)2(aq)
What volume (in ml) of 0.247M MgCl2(aq) is required to react with 63.2 mL of 0.192M AgNO3(aq)?
Answer:
V=24,3mL
Explanation:
1)n(AgNO3)=Cm*V=0.063l*0.192M=0.012
2)n(AgNO3)/2=n(MgCl2) => MgCl2=0.012/2=0.006
3)V(MgCl2)=n/Cm=0.006/0.247=0.0243L=24,3ml
How many moles of nitrogen gas would be produced if 3.27 moles of copper(II) oxide were reacted with excess ammonia in the following chemical reaction? 2 NH3(g) + 3 CuO (s) – 3 Cu(s) + N2(g) + 3 H2O(g)
Moles of Nitrogen(N₂) gas would be produced : 1.09
Further explanationThe reaction coefficient in a chemical equation shows the mole ratio of the components of the reactants and products
If one mole of the reactant or product is known, then we can determine the moles of the other compounds involved in the reaction
Reaction
2NH₃(g) + 3CuO (s) ⇒ 3Cu(s) + N₂(g) + 3 H₂O(g)
Copper(II) oxide was reacted with excess Ammonia, so CuO as a limiting reactant and moles of the product is based on moles of CuO
moles of CuO = 3.27
From the equation, the mol ratio of CuO : mol N₂ = 3 : 1, so mol N₂ :
[tex]\tt \dfrac{1}{3}\times 3.27=1.09[/tex]
Carbon-14 has a half-life of 5715 years. It is used to determine the age of
ancient objects. If a sample today contains 0.060 mg of carbon-14, how much
carbon-14 will be present after 28,575?
The sample of Carbon-14 after 28,575 years=0.001875 mg
Further explanationGeneral formulas used in decay:
[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{T/t\frac{1}{2} }}}[/tex]
T = duration of decay
t 1/2 = half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
Carbon-14 has a half-life of 5715 years, so t1/2=5715 years
A sample today contains 0.060 mg of carbon-14, so No=0.06 mg, then :
[tex]\tt Nt=0.06(\dfrac{1}{2})^{28575/5715}\\\\Nt=0.06(\dfrac{1}{2})^5\\\\Nt=0.001875~mg[/tex]
Car battery energy that makes device work
Answer:
No it's not make device work
Explanation:
I think soo
Which of the following is a simple definition of reduction?
A. the loss of electrons
B. the gain of electrons
C. an agent that oxidizes something
D. an agent that reduces something
The answer is B on Edg 2020
Answer:
B. the gain of electrons
Explanation:
An easy way to remember this concept is the pneumonic OIL RIG:
Oxidation is Loss (of electrons)
Reduction is Gain (of electrons)
The common name for butanone, a readily available solvent, is
Answer:
methyl ethyl ketone
Explanation:
(MEK)