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dlinn [17]
2 years ago
5

Bonnie is three times as old as her brother, h. The sum of their ages is less than 44. What is the greatest age Bonnie’s brother

can be?
Which inequality models this problem?


A. 3h + h 44
D. 3h + h ≥ 44


Solve:
Mathematics
1 answer:
Margarita [4]2 years ago
3 0
The answer is D .
because it says less than 44
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How many grams of NH3 are required to produce 4.65 g of HF
nignag [31]

1.326 grams of NH3 are required to produce 4.65 g of HF.

Step-by-step explanation:

Balanced chemical reaction is written first to know the number of moles taking part in original reaction.

NH3 +3 F2 ⇒3 HF  +  NF3

Given:

mass of HF = 4.65

First the number of moles of HF in 4.65 grams is calculated by using the formula:

number of moles (n) = \frac{mass}{atomic mass of 1 mole}

atomic mass of HF = 20 grams/mole

putting the values in the above equation number of moles can be found.

n = \frac{4.65}{20}

  = 0.235 moles of HF are given.

From the equation it can be said that:

1 mole of NH3 reacts to form 3 moles of HF

so, x moles of NH3 would react to form 0.235 moles of HF

\frac{3}{1} = \frac{0.235}{x}

3x = 0.235

x = \frac{0.235}{3}

x = 0.078 moles of NH3 is required.

The moles are converted to mass by applying the formula:

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        putting the values in the formula

mass = 17 X 0.078

mass = 1.326 grams

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