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Lubov Fominskaja [6]
3 years ago
12

Riya rides his bike 63 miles in 270 minutes. What is his average speed in miles per hour? Be sure to include the equation for sp

eed in your answer.
Chemistry
1 answer:
antoniya [11.8K]3 years ago
6 0
Time t=270 minutes=270/60=9/2 hours
distance s=63 miles
average speed v=s/t=63 ÷\frac{9}{2}
=63×\frac{2}{9}
=14 miles/hour
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Vhat determines a substance's state of matter?
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The Ka for formic acid (HCO2H) is 1.8 × 10-4. What is the pH of a 0.35 M aqueous solution of sodium formate (NaHCO2)?
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Answer:

9.36

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K_a of formic acid = 1.8\times 10^{-4}

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So,

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HCOONa    ⇒     Na⁺ +    HCOO⁻

Consider the ICE take for the formate  ion as:

                                   HCOO⁻ + H₂O   ⇄   HCOOH + OH⁻

At t=0                              0.35                            -              -

At t =equilibrium           (0.35-x)                          x           x            

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K_{b}=\frac {[OH^-][HCOOH]}{[HCOO^-]}

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Solving for x, we get:

x = 0.44×10⁻⁵  M

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pH + pOH = 14

So,

<u>pH = 14 - 4.64 = 9.36</u>

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