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1. Chemistry

   a) How many moles of atoms are in 7.00 g of 13C? Answer "0.538" mol 13C b) Based on your answer in Part A, calculate the number of atoms in this amount of 13C? Answer "3.24×10^23" 13C atom c) Based on your answer in Part B, how

2. chemistry

   In part B of my question, I was asked calculate the number of atoms in 0.615 mol of 13C (mass number of this Carbon is 13). I received the correct answer of 3.70E23 atoms. However, I do not know how to do Part C of my question,

3. Algebra 1B Radical expressions & data analysis

   1. Simplify 2/√5 A. 2/√5 B. √10 C. √10/5 D. 2√10/5 *** My answer 2. Simplify -11√112 A. -44√7 B. -176 √7 C. -27 √7 D. 4√7 *** My answer 3. Simplify 17√17 -9 √17 A. 8 *** My answer B. 8√17 C. 26√17 D.

4. Algebra

   1. Simplify the expression: 4√18+5√32 A.45√2 B.32√2 C.116√2 D.9√50 2. Simplify the expression: 7√5-3√80 A.-5√5 B.-4√75 C.-5 D.4√-75 3. Simplify the expression: √21(√3+√14) A.9√7-49√6 B.2√6+√35

1. Organic Chemsitry

   By knowing the natural abundance of minor isotopes, it's possible to calculate the relative heights of M+ and M+1 peaks. If natural abundances are 12C - 98.9% and 13C - 1.10%, what are the relative heights, to the nearest 0.1%, of

2. URGENTquestions for Math

   A pair of jeans is on sale for 25% off the original price. Which expression represents the sale price? If the original price of the jeans is $40,evaluate the expression to find the sale price. s=p-0.25 p;$30 s=p-25:$15***

3. chemistry

   Lesson 16: Unit Test CHEM A Unit 5: Chemical Formulas and Reactions 1c 2b 3c 4a 5a 6c 7b 8b 9a 10b 11d 12c 13c 14d 15a 16c 17a 18d 19c 20a 21b 22c 23c 24c

4. Algebra

   1. Simplify 5^-1(3^-2) A. 45 B. 1/45 C. 15^-3 D. 15^2 2. Simplify (3xy^3)^2(xy)^6 A. 9x^8y^12 B. 3x^8y^12 C. 2x^3y^12 D. 9x^8y^9 3. Simplify. Written in scientific notation. 0.5(8 x 10^5) A. 8 x 5^4 B. 4 x 5^5 C. 8 x 10^5 D. 4 x

1. chemistry

   In part B of my question, I was asked calculate the number of atoms in 0.462 mol of 13C (mass number of this Carbon is 13). I received the correct answer of 2.78E23 atoms. However, I do not know how to do Part C of my question,

2. Math

   1. solve the equation. -9v - 5 = -95 A. 17 B. 11 C. 10 ** D. -10 2. Solve the equation. X/4 - 5 = -8 A. -27 B. -12 ** C. -7 D. 12 3. Solve the equation. d/3 + 10 = 7 A. 51 B. 20 ** C. 0 D. -9 4. Solve the equation. 2(2 - 2k) = -3k

3. algebra

   am I right? 1. Simplify radical expression sqrt 50 5 sqrt ^2*** 2 sqrt ^5 5 sqrt ^10 5 2. Simplify the radical expression sqrt 56x^2 28x 2x sqrt 14*** 2x sqrt 7 sqrt 14x2 3. Simplify the radical expression. sqrt 490y^5w^6 2 sqrt

4. maths algebric

   (15a+24b+13c)-(12a+18b+11c)

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