Chemistry

posted by .

please check my answers for the following questions.

1) when a measurement that has six significant digits is divided by a measurement that has three significant digits, how many significant digits should the answer have?
ANSWER: 2

2) How many hydrogen atoms are in 5 molecules of isopropyl alcohol, C3H7O?
ANSWER: 35

3) How many moles of SO3 are in 2.4 x 10^24 molecules of SO3
ANSWER: 4.0

Number one is incorrect. Three is the answer: in muliplication and division, the answer is limited to the number of significant digits of the least number. In this case, three is the limit in the denominator.

The chemical formula for aspirin is C9H8O4 What is the mass of 0.40 mol of aspirin?
45g
10.8g
160g
72g

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    We are currently studying significant digits/figures. I was asked to add 150 ml with 76.9 ml, plus 209 ml plus 0.036 ml. The book says the answer is 440, but I got 435. (the complete answer, without applying the significant digits …
  2. Physics

    Calculate the answer for the following question and state the answer with the correct certainty and units. Given the values of b and h, find A. b=3.2 cm, h=10.1 cm A=1/2bh The answer is 16 cm^2, which was rounded to two significant …
  3. Physics - bobpursely

    State the number of significant figures. 1) 809 Answer : 3 2) 0.0060 Answer : 5?
  4. Physics

    Talking about significant figures, my Physics textbook lists 5 rules for determining significant figures. 1) All nonzero digits are significant. 2) Zeros to the right of nonzero digits in a number containing a decimal point are significant. …
  5. Algebra 8th

    Find the greatest possible error for each measurement. 953 mi 0.5 mi Find the greatest possible error for each measurement. 1 3/4 c not-- 1/4 c Find the greatest possible error for each measurement. 12.3 L 0.05L Find the greatest possible …
  6. Math - Precision and Significant Digits

    Please help me with the following: Find each product or quotient. Use significant digits. 0.0505m x 665m A. 33.6 m^2 B. 33.58 m^2 C. 33.50 m^2 D. 3.582 m^2 I think the answer is A. Is this correct?
  7. Math - More Precision and Significant Digits

    Please help me with the following problems: 3. Choose the more precise measurement. 6 cm or 2.5 cm I think it is 2.5 cm. Is this correct?
  8. physics

    how many significant digits are in the following measurement 2.546m
  9. Algebra 1 (Check work)

    4. A square has a side of 6.25 feet. What is the area in square feet?
  10. Math

    In a class of 83 students, 72 are present. What percentage of the students are absent?

More Similar Questions