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15 days ago

A person loses 2.70 lbs in two weeks how many grams did he lose?

Chemistry

2 answers:

VMariaS [1K]15 days ago

6 0

He lost 1224.7 grams.

Alekssandra [968]15 days ago

5 0

I concur with angeliticsoul; the individual lost 1224.7 grams.

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65g of nitric acid are produced in a reaction. 2.5g of platinum are added to the reaction vessel at the start of the reaction to

alisha [964]

Answer:

2.5 g of platinum

Explanation:

A catalyst is a substance added to a reaction to enhance the reaction speed. It does not undergo any change during the reaction, meaning it remains unchanged after the reaction concludes. The role of a catalyst is to provide an alternative pathway for the reaction by reducing the activation energy required. Therefore, a catalyzed reaction occurs more rapidly and requires less energy compared to an uncatalyzed one.

Since catalysts do not get involved in reactions and retain their mass post-reaction, the amount of platinum will stay the same (2.5g). The mass can only alter if a substance participates in the chemical process. Thus, this is the response.

6 0

3 days ago

The ionic radius of a sodium ion is 2.27 angstroms (A) . What is this length in um

lions [985]

$\boxed{\sf 1Å=10^{-10}m}$

$\\ \rm\longmapsto 2.27Å$

$\\ \rm\longmapsto 2.27\times 10^{-10}m$

$\\ \rm\longmapsto 0.227\times 10^{-9}m$

$\\ \rm\longmapsto 0.0227\times 10^{-8}m$

$\\ \rm\longmapsto 0.00227\times 10^{-7}m$

$\\ \rm\longmapsto 0.00023\times 10^{-6}m$

$\\ \rm\longmapsto 0.00023\mu m$

6 0

12 days ago

Write the chemical formula for iridium(III) nitride?

lorasvet [956]

Answer:

Ir(NO2)3

Explanation:

The molar mass is 330.2335, in case that's also required.

3 0

9 days ago

Barbiturates, including "truth serums" seen in movies like Meet the Fockers and sedatives that may have led to the untimely deat

Alekssandra [968]

Answer:

Explanation:

Diethyl malonate possesses greater acidity compared to monocarbonyl substances (pKa=13) because its alpha hydrogens are linked to two carbonyl groups. Consequently, the malonic ester can be readily changed into its enolate ion by reacting it with sodium ethoxide in ethanol. When the malonic ester undergoes alkylation, a hydrogen atom in the alpha position becomes acidic, permitting another round of alkylation to yield a dialkylated malonic ester.

In this scenario, when diethyl malonate interacts with urea in the presence of sodium ethoxide base, the second alkylation step occurs within the molecule, producing a cyclic compound known as barbituric acid.

8 0

1 day ago

N2 and H2 are mixed in 14:3 mass ratio. After certain time ammonia was found to be 40% by mol. The mole fraction of N2 at that t

lorasvet [956]

Answer: The mole fraction of nitrogen is calculated to be 0.4615.

Explanation: In the mixture of nitrogen ( $N_{2}$ ) and hydrogen ( $H_{2}$ ), the mole ratio established is 1: 1.5.

At this juncture, we identify that ( $H_{2}$ ) serves as the limiting reagent.

When 0.4 moles of ( $NH_{3}$ ) are produced, it will require 0.4 moles of ( $N_{2}$ ) along with 3.4 moles of ( $H_{2}$ ).

The total amount of remaining ( $N_{2}$ ) ends up being 0.6, while the amount of ( $H_{2}$ ) left in the mixture is 0.3 moles.

The mole fraction of ( $N_{2}$ ) is computed as 0.6 divided by the sum of 0.6, 0.4, and 0.3, resulting in 0.4615.

8 0

12 days ago

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