Give the number of protons, neutrons, and electrons in an atom of the^10Sr isoto

Question

Give the number of protons, neutrons, and electrons in an atom of the^10Sr isotope. 52 p, 38 n, 52 e 38 p, 90 n, 38 e 38 p, 38 n 38 e 38 p, 52 n, 38 e 90 p, 38 n, 90 e Calculate the molarity of a solution that contains 70.0 g of H_2SO_4 in 280. mL of solution 6.84 M 2.55 M 8.62 M 9.78 M 11.84 M Isotopes are atoms of the same element that have different nuclear charges. have different numbers of protons. have different atomic numbers. have different numbers of electrons. have different numbers of neutrons. How many grams of KOH are contained in 400. mL of 0.250 m KOH solution? 89.8 g 8.98 g 12.4 g 35.1 g 5.61 g Simple positively charged ions are always. than the neutral atoms from which they are formed. isoelectronic larger the same size smaller more anionic The number of can change without changing the element. electrons only neutron only protons only all of the above neutrons and electrons only is a noble gas. The number of electrons in a neutral atom of an element is always equal to the of the element. Avogadro's number isotope number mass number atomic number atomic mass unit A 10.0-L flask contains 0.400 mole of H_2, 0.300 mole of He and 0.500 mole of Ne at 35.0 degree C. What is the partial pressure of the Ne? 1.05 atm 0.144 atm 1.69 atm 1.26 atm 3.03 atm

Explanation / Answer

9.

38p, 52n, 38e (Option d)

10.

Molar mass of H2SO4 = 2 + 32 + 64 = 98 g/mol

Mass of H2SO4 = 70 g

Molarity of H2SO4 = (70 / 98) x (1000 / 280) = 2.55 M (Option B)

11.

Option E (since isotopes have the same atomic no. but different atomic mass)

12.

Moles of KOH = 0.25 * 0.4 = 0.1 mol

Molar mass of KOH = 39 + 16 + 1 = 56 g / mol

Mass of KOH = 0.1 x 56 = 5.6 g (Option E)

13.

Option D (since electron-electron repulsion decreases and shielding decreases)

14.

Option B

15.

Option A

16.

Option D

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