How long have orca whales been on the endangered species list?

Considered this question: what is the mass of solute in 200.0 L of a 1.556-M solution of KBR?

IgorC [24]

Hey there!:

a )

number of moles of solute :

moles of solute = molarity x volume ( L )

moles of solute = 1.556 x 200.0

moles of solute = 311.2 moles of KBr

____________________________________________

b) Molar mass of KBr : 119.002 g/mol

1 mole KBr ----------------- 119.002 g

311.2 moles ---------------------- ( mass KBr ) ?

mass glucose = 311.2 x 119.002 / 1

mass glucose => 37033.4224 g

7 0

3 years ago

How many moles of NaF are produced in the resction between sodium bromide and calcium fluoride when 550 grams of sodium bromide

bija089 [108]

Answer: 5 moles of NaF would be produced when 550 grams of Sodium bromide are used.

Explanation:

From the question, the balanced chemical formula is illustrated below:

2NaBr + CaF2 → 2NaF + CaBr2

From the equation above;

Molecular mass of NaBr = 23 + 80 = 103g/ mol

Molecular mass of CaF2= 40+ (19×2)= 78g/ mol

Molecular mass of NaF = 23+19 = 42g/ mol

From the balanced chemical equation;

2 moles of NaBr reacted with 1mole of CaF to give 2 moles of NaF.

That is, 2 moles of NaBr= 2× 103 = 206g

2moles of NaF = 2×42= 84g

If 206g of NaBr yielded 84g of NaF

Therefore 550g of NaBr will yield Xg of NaF

X= 550×84/206

X= 224.27g of NaF

But 42g = 1 mole of NaF

Therefore 224.27g = X mole of NaF

X= 224.27 ×1/42

X is approximately 5moles.

6 0

3 years ago

Ammonium perchlorate is the solid rocket fuel used by the U.S. Space Shuttle. It reacts with itself to produce nitrogen gas , ch

SpyIntel [72]

Answer:

2.94 g of water are produced by this decomposition

Explanation:

We need to determine the reaction to solve this problem:

The reactant is the ammonium perchlorate

The products are N₂, Cl₂, O₂ and H₂O

The reaction is: 2NH₄ClO₄ → N₂ + Cl₂ + 2O₂ + 4H₂O

We convert the mass of the reactant to moles:

9.6 g . 1 mol / 117.45 g = 0.0817 moles

Ratio is 2:4. Let's make a rule of three:

2 moles of perchlorate produce 4 moles of water.

Then, 0.0817 moles of perchlorate will produce (0.0817 . 4)/2 = 0.163 moles

We convert the moles of produced water, to mass (g)

0.613 mol . 18 g / 1mol = 2.94 g

8 0

3 years ago

Widte speed rom me and distance 502

Jobisdone [24]

The speed of the yacht : 100 km/h

<h3>Further explanation </h3>

Linear motion consists of 2: constant velocity motion with constant velocity and uniformly accelerated motion with constant acceleration

At constant velocity motion:

the speed of vo = v = constant

acceleration = a = 0

Δx = vt or x = xo + vt

An equation of constant velocity motion

$\large {\boxed {\bold {x = v \times \: t}}}$

x = distance = m

v = speed = m / s

t = time = seconds

A yacht sailed at a steady speed for 0.5 hours, and traveled 50 kilometers

so the velocity/speed:

$\tt v=\dfrac{x}{t}\\\\v=\dfrac{50~km}{0.5~h}=\boxed{\bold{100~km/h}}$

5 0

3 years ago

What occurs at the reaction velocity (CaCo3 + 2HCL- CaCl2 + Co2 + H2O) ... if we add water to hydrochloric acid?

Juli2301 [7.4K]

IT IS HIGHLY EXOTHERMIC REACTION AND HEAT IS PRODUCED IN LARGE AMOUNT BECAUSE WHEN WE ADD ACID TO WATER HIGH ENERGY AND HEAT IS PRODUCED

6 0

3 years ago