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Chapter 3: Problem 12

You react chemical \(A\) with chemical \(B\) to make one product. It takes 100 of \(A\) to react completely with 20 \(\mathrm{g}\) of \(B\) . What is the mass of the product? a. less than 10 g b. between 20 and 100 g c. between 100 and 120 g d. exactly 120 g e. more than 120 g

Short Answer

Expert verified
The mass of the product is exactly 120 g (answer choice d).

Step by step solution

01

Understanding the Conservation of Mass Principle

In a chemical reaction, mass is conserved. This means that the total mass of the reactants (chemicals A and B) will be equal to the total mass of the product(s).
02

Identifying the mass of reactants

According to the problem, we have 100 g of chemical A and 20 g of chemical B. We need to find the total mass of these reactants.
03

Calculating the mass of the reactants

To find the total mass of the reactants, we simply add the mass of chemical A and the mass of chemical B: Total mass of reactants = mass of chemical A + mass of chemical B Total mass of reactants = 100 g + 20 g
04

Solving for the mass of the reactants

Now, let's calculate the total mass of the reactants: Total mass of reactants = 100 g + 20 g Total mass of reactants = 120 g
05

Comparing the mass of the product to the answer choices

Since the mass of the product should equal the total mass of the reactants (because of mass conservation), we can deduce that the mass of the product is 120 g. Comparing this value to the answer choices, we find that the correct answer is: d. exactly 120 g

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Most popular questions from this chapter

An ionic compound \(\mathrm{MX}_{3}\) is prepared according to the following unbalanced chemical equation. $$ \mathrm{M}+\mathrm{X}_{2} \longrightarrow \mathrm{MX}_{3} $$ A 0.105 -g sample of \(\mathrm{X}_{2}\) contains \(8.92 \times 10^{20}\) molecules. The compound \(\mathrm{MX}_{3}\) consists of 54.47$\% \mathrm{X} \mathrm{by}\( mass. What are the identities of \)\mathrm{M}\( and \)\mathrm{X}$ , and what is the correct name for \(\mathrm{MX}_{3} ?\) Starting with 1.00 \(\mathrm{g}\) each of \(\mathrm{M}\) and \(\mathrm{X}_{2},\) what mass of \(\mathrm{MX}_{3} \mathrm{can}\) be prepared?

A binary compound between an unknown element \(\mathrm{E}\) and hydrogen contains 91.27\(\% \mathrm{E}\) and 8.73\(\% \mathrm{H}\) by mass. If the formula of the compound is \(\mathrm{E}_{3} \mathrm{H}_{8},\) calculate the atomic mass of \(\mathrm{E}\)

Hydrogen peroxide is used as a cleansing agent in the treatment of cuts and abrasions for several reasons. It is an oxidizing agent that can directly kill many microorganisms; it decomposes on contact with blood, releasing elemental oxygen gas (which inhibits the growth of anaerobic microorganisms); and it foams on contact with blood, which provides a cleansing action. In the laboratory, small quantities of hydrogen peroxide can be prepared by the action of an acid on an alkaline earth metal peroxide, such as barium peroxide: $$ \mathrm{BaO}_{2}(s)+2 \mathrm{HCl}(a q) \longrightarrow \mathrm{H}_{2} \mathrm{O}_{2}(a q)+\mathrm{BaCl}_{2}(a q) $$ What mass of hydrogen peroxide should result when 1.50 \(\mathrm{g}\) barium peroxide is treated with 88.0 \(\mathrm{mL}\) hydrochloric acid solution containing 0.0272 \(\mathrm{g} \mathrm{HCl}\) per mL? What mass of which reagent is left unreacted?

The compound cisplatin, $\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2},$ has been studied as an antitumor agent. Cisplatin is synthesized as follows: $$ \mathrm{K}_{2} \mathrm{PtCl}_{4}(a q)+2 \mathrm{NH}_{3}(a q) \rightarrow \operatorname{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}(s)+2 \mathrm{KCl}(a q) $$ What mass of cisplatin can be produced from \(100 .\) g of $\mathrm{K}_{2} \mathrm{PtCl}_{4}\( and sufficient \)\mathrm{NH}_{3} ?$

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