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Jennyjanapingo
Answered

B. Study the given sample problem on how to get the percent by mass and percent by volume and solve practice problems 1 & 2

Practice Problem 1:
A Bicol Tablea is sold in a store. Its mass is 8 grams containing 5.2 grams cocoa powder. What is the percent by . mass of cocoa powder?

Practice Problem 2:
An alcohol is used as disinfectants. Its total volume is 100 ml containing 70 ml ethyl alcohol. What is the percentage by volume of ethyl alcohol?​

Sagot :

RhoZetago

✏️ Mass Percent and Volume Percent

[tex] {\Large{\overline{\underline{\sf{\hookrightarrow Answers:}}}}} [/tex]

  1. The mass percent is 65%.
  2. The volume percent is 70%.

Solutions:

1.

Given that:

  • the mass of the component is 5.2 g
  • the total mass is 8 g

Solve:

[tex] {\boxed{\sf{mass\:percent =\frac{mass\:of\:component}{total\:mass} \times 100 \% }}} [/tex]

  • [tex] \sf{mass\:percent =\frac{5.2\:g}{8\:g} \times 100 \% } [/tex]

  • [tex] \sf{mass\:percent = 0.65 \times 100 \% } [/tex]

  • [tex] {\sf \therefore mass\:percent = {\boxed{\green{\sf{65 \%}}}}} [/tex]

2.

Given that:

  • the volume of the solute is 70 mL
  • the volume of the solution is 100 mL

Solve:

[tex] {\boxed{\sf{volume\:percent =\frac{volume\:of\:solute}{volume\:of\:solution} \times 100 \% }}} [/tex]

  • [tex] \sf{volume\:percent =\frac{70\:mL}{100\:mL} \times 100 \% } [/tex]

  • [tex] \sf{volume\:percent = 0.7 \times 100 \% } [/tex]

  • [tex] {\sf \therefore volume\:percent = {\boxed{\green{\sf{70 \%}}}}} [/tex]

[tex]{\: \:}[/tex]

[tex] {\huge{\overline{\sf{Hope\:It\:Helps}}}} [/tex]

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