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lys-0071 [83]
3 years ago
6

How long in hours would it take a runner to finish an 11 km race if she is running at a pace of 5.7 mi/hr?

Chemistry
2 answers:
Alenkinab [10]3 years ago
6 0

It would take 1.16 h for the runner to finish the race .

<em>Step 1. </em>Convert <em>kilometres to miles</em>.

11 km × (0.621 mi/1 km) = 6.83 mi

<em>Step 2</em>. Calculate the <em>time</em>.

Time = 6.83 mi × (1 h/5.7 mi) = 1.16 h

Oliga [24]3 years ago
5 0

Answer:  1.199 hour runner will require to cover the 11 km .

Explanation:

Distance covered by  runner = 11 km = 11 × 0.6213 miles = 6.8343 miles

1 km = 0.6213 mile

Speed of the runner = 5.7 mile/hour

speed=\frac{distance}{time}

5.7 mile/hour=\frac{6.8343 miles}{time}

time=\frac{6.8343 miles}{5.7 mile/hour}=1.199 hour

1.199 hour runner will require to cover the 11 km .

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You prepare a 2nd solution (solution B) by pipetting 10.00 ml of your 1st solution (solution A) into a 50.00 ml volumetric flask
elena-14-01-66 [18.8K]

Answer:

Concentration solution A was 0.5225 M

Explanation:

10.00 mL of solution A was diluted to 50.00 mL and yields 50.00 mL of solution B

According to laws of dilution-      C_{A}V_{A}=C_{B}V_{B}

where, C_{A} and C_{B} are concentration of solution A and B respectively

V_{A} and V_{B} are volumes of solution A and B respectively

Here C_{B} = 0.1045 M, V_{B} = 50.00 mL and V_{A} = 10.00 mL

Hence, C_{A}=\frac{C_{B}V_{B}}{V_{A}}=\frac{(0.1045M\times 50.00mL)}{10.00mL}=0.5225M

So, concentration solution A was 0.5225 M

8 0
3 years ago
What are 4 other gases in the atmosphere besides oxegen and nitergin?
Levart [38]
Helium, neon,nitrogen and argon
5 0
3 years ago
How many total electrons does the P^3- ion have? O a. 3 O b. 31 O c.1 O d. 15 O e. 18
STALIN [3.7K]

Answer:

e. 18

Explanation:

A neutral P atom has an atomic number of 15, which means there are 15 protons in the atom. In order to be neutral, the P atom must also have 15 electrons.

The P³⁻ anion has 3 electrons more than the neutral P atom since it has a charge of -3.

Thus, the total number of electrons are 15 + 3 = 18 electrons.

7 0
3 years ago
Calculate AH for the reaction:<br> 2N2 (g) + 6H20 (g) → 302 (g) + 4NH3(g)
Ratling [72]

Answer:

Explanation:

4NH₃ (g) + 3O₂ (g) ⇒ 2N₂ (g) + 6H₂ O(1)

ΔH_r={\sum}{ \Delta }H_f(\text{product})-{\sum}{ \Delta }H_f(\text{reactant})

ΔH r =(2ΔH f(N 2 )+6ΔH f (H 2 O(l)))−(4ΔH f​ (NH 3 (g))+3ΔH f (O 2 (g)))

ΔH rex =[2×0+6×(−286)]−[4×(−46)+3×0]=−1716+186

ΔH rex =−1532kJ/mol

Thermodynamics is a branch of physical chemistry that studies heat and its effects and interactions. Governed by the four main laws, thermodynamics plays a huge role in physics and chemistry, and is also responsible for the law of conservation of energy, a fundamental rule in science.

7 0
1 year ago
How many PO43? ions are in a mole of K3PO4?
adoni [48]

K₃PO₄ → 3K⁺ (aq) + PO₄³⁻(aq)

One mole of PO₄³⁻ ion gets dissociated from one mole of K₃PO₄

As per the definition of Avogadro's number, 1 mole = 6.022 x 10²³ ions

One mole of PO₄³⁻ ions x  (6.022 x 10²³ ions/ 1 mole of PO₄³⁻ ions )

= 6.022 x 10²³ ions

Therefore , there are 6.022 x 10²³ PO₄³⁻ ions in a mole of K₃PO₄.

7 0
3 years ago
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